So you’ve got a flight booked out of a US airport and you’re already picturing the queue. The belt, the bins, the bloke in front of you who somehow still doesn’t know his laptop comes out. It’s fine. Airport security in the States has actually changed quite a bit lately, and most of those changes are in your favour for once.
This guide walks you through the whole lot: the liquids rule, the new ID requirement, what’s happening with shoes (yes, that), power banks, the skip-the-line programmes, and the small stuff that trips people up at the checkpoint. I’ve flown in and out of US airports more times than I’d care to add up, and I’ve watched the process shift from “take off half your outfit” to something genuinely quicker. Atlanta on a Monday morning is still Atlanta on a Monday morning, mind. Some things no amount of new tech will fix.
Here’s what you actually need to know before you fly.
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US Airport Security Rules: Quick Facts
Liquids: The 3-1-1 rule still stands. Containers of 3.4oz (100ml) or less, all inside one quart-size clear bag, one bag per person.
Shoes: You no longer have to take them off at standard checkpoints. This is nationwide, all ages.
ID: Adults now need a REAL ID-compliant licence (the one with the star) or a valid passport to board a domestic flight.
Power banks: Carry-on only, always. Never in your checked bag. Most standard ones are fine capacity-wise.
Newer scanners: At many big hubs, CT machines mean you can leave liquids and laptops inside your bag. But it varies lane to lane, so pack as if you'll need to pull them out.
Skip the queue: TSA PreCheck speeds up security. Global Entry does that plus customs on the way back into the country.
Tinker's Tip: Screening genuinely differs from one airport to the next while the newer scanners roll out. The trick is to pack to the strictest version of the rules. If your bag's ready for a full unpack, a quick lane feels like a bonus. Do it the other way round and you're the one holding up the belt.
What's actually changed at US airport security
If you haven’t flown in the States for a couple of years, a few things will feel different. Not wildly different, but enough that your old muscle memory might be out of date.
The headline one: you can keep your shoes on now. That policy hung around for the best part of two decades and it’s finally gone at standard checkpoints. Second, there’s the ID situation, which is the one that can actually stop you boarding if you get it wrong, so we’ll spend proper time on it. And third, the big airports have been quietly swapping their flat X-ray machines for CT scanners that build a 3D image of your bag. At those lanes you often leave everything packed. Liquids in, laptop in, done.
What hasn’t changed is the liquids limit itself. People keep hearing “the rules are relaxing” and assume they can chuck a full bottle of water in their bag. They can’t. The scanner changes how your bag is checked, not how much liquid you’re allowed. Worth being clear on that early, because it’s the single biggest cause of confiscated stuff and grumbling at the belt.
Fact: The shoe rule dates back to a foiled attack involving explosives hidden in footwear. Screening tech has moved on so far since then that it can spot the same threats without you hopping about barefoot on that grubby floor. Which, honestly, most of us will not miss.
REAL ID and what counts as acceptable ID
This is the one to sort before you even leave the house, because the airport is the worst possible place to discover a problem with it.
Every adult (18 and over) flying domestically now has to show a REAL ID-compliant driving licence or another accepted document at the checkpoint. A standard licence with no star on it is no longer enough on its own. You’re looking for a small star in the top corner of the card. If it’s got one, you’re good. If it doesn’t, you need a backup.
The easiest backup, and the one I’d always tell a friend to carry anyway, is your passport. A valid US passport or passport card is accepted at every checkpoint, star on your licence or no star. If you’re an international visitor reading this, you’ve already got that box ticked, since you’re flying on your passport regardless.
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| Accepted at the checkpoint | Good to know |
|---|---|
| REAL ID-compliant driving licence or state ID | Look for the star in the top corner |
| US passport or passport card | Always accepted, star or not. The safest catch-all |
| Enhanced driving licence (flag symbol) | Issued by a handful of states |
| Permanent Resident Card | For green card holders |
| DHS trusted traveller card | Global Entry, NEXUS and similar count |
| US military or DoD ID | Accepted in place of REAL ID |
So what happens if you rock up with none of the above? You’re not automatically turned away, but you’re in for a slow one. There’s a backup identity-verification process where you pay a non-refundable fee of around $45 (roughly £36 / €41) and go through extra checks that can take half an hour or more. And even then, if they can’t confirm who you are, you don’t fly. Not a gamble I’d take with a flight to catch.
Watch out: Getting a REAL ID sorted at the DMV can take weeks, and some offices are appointment-only. Don’t leave it to the fortnight before your trip. If there’s any doubt, travel on your passport and deal with the licence later.
One nice bit of news for parents: children under 18 don’t need to show ID when they’re flying domestically with an adult who has acceptable ID. So it’s really you that needs to be sorted, not the whole family.
The 3-1-1 liquids rule (still the thing that catches people)
Right. Liquids. The rule that has confused travellers for the best part of twenty years and, spoiler, still confuses them now.
Here it is in plain English. Every liquid, gel, aerosol, cream or paste in your carry-on has to be in a container of 3.4oz (100ml) or less. All of those containers have to fit inside a single clear, quart-size resealable bag. And you get one bag per person. That’s the whole “3-1-1”: 3.4 ounces, 1 bag, 1 traveller.
The bit that catches people is that it’s the container size that matters, not how much is left in it. A half-empty 6oz bottle is still a 6oz bottle as far as the officer is concerned, and it’s going in the bin. I’ve watched someone argue this at length in Newark. The bottle still lost.
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| Counts as a liquid (3-1-1 applies) | Doesn’t count (pack freely) |
|---|---|
| Shampoo, conditioner, shower gel | Bar soap, shampoo and conditioner bars |
| Toothpaste and other pastes | Solid deodorant sticks |
| Sun cream (liquid or spray) | Solid sunscreen sticks |
| Mascara, liquid foundation, gels | Powder make-up, solid perfume |
| Peanut butter, honey, yoghurt, soft cheese | Solid snacks, sandwiches, crisps |
See that right-hand column? That’s your loophole, and it’s a good one. Swapping a couple of liquids for solid versions frees up space in your little bag and gives you fewer things to fish out at the checkpoint. I switched to a shampoo bar years ago mostly for this reason and never looked back.
A few things sit outside the 3-1-1 limit entirely. Prescription and over-the-counter liquid medications are allowed in bigger quantities, as long as it’s a reasonable amount for your trip. Baby formula and breast milk are fine in the amounts you actually need. Hand sanitiser gets a more generous allowance than standard liquids too. The catch with all of these: tell the officer and keep them somewhere easy to reach, because you may need to pull them out to be screened separately.
Quick win: Bring an empty water bottle through security and fill it at a fountain on the other side. Empty is allowed, and most US airports have fountains or bottle-fillers now. Saves you buying a $4 bottle at the gate, which always stings.
Related Article: If you want the deeper dive on what does and doesn’t count as a liquid, my full breakdown of the airport 100ml liquid rule goes through every awkward edge case.
Do you still have to take your shoes off?
Short version: no, not at a standard checkpoint. You keep them on. All ages, everywhere, no PreCheck required.
It’s a small thing that makes a genuinely big difference to the flow of a queue. No more balancing on one foot, no more that awkward barefoot shuffle to the bins, no more re-lacing your boots while forty people wait behind you. The whole line just moves better.
There are a couple of exceptions worth knowing. If you get pulled for secondary screening, or something alarms and they want a closer look, you might still be asked to slip them off. And travellers going through the extra ID checks (the ones without acceptable ID) can be subject to more thorough screening in general. For the vast majority of people on a normal day, though? Shoes stay on.
Timing tip: Even with shoes staying on, arrive earlier than feels necessary at big hubs during peak weeks. Thanksgiving, the run-up to Christmas, and the start of summer can still produce lines that stretch on for ages, tech or no tech.
Laptops, electronics and the CT scanner lanes
At older lanes with the flat X-ray machines, the rule is the same as it’s always been: laptop and any large electronics come out of your bag and go in a bin on their own, so they can be seen clearly.
At the newer CT lanes, the machine builds a 3D image detailed enough that you can usually leave your laptop tucked inside your bag. Same goes for your quart bag of liquids. It’s faster, it’s less faff, and it’s spreading to more checkpoints all the time, starting with the big hubs.
The problem is you can’t tell from the queue which lane you’ll get. One might be CT, the next one along might not be. So my rule of thumb is simple: pack your laptop somewhere you can grab it in two seconds. If the lane’s a CT one, great, leave it in. If it isn’t, you’re not the person frantically digging through a stuffed rucksack while the officer waits.
Good to know: Landing somewhere new and want data the moment you step off the plane? Sorting an eSIM before you fly means no hunting for airport wifi or a SIM kiosk while you’re jet-lagged and hauling a bag. I set one up for every trip now.
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Browse the shopPower banks and spare batteries
This is the one people get wrong most often, and it can cost you the battery or hold up your whole bag.
Power banks and spare lithium batteries must travel in your carry-on. Never in a checked bag. Not ever. The reason is straightforward: if a lithium battery overheats, the crew can deal with it in the cabin, but a fire in the cargo hold below you is a far more dangerous problem. So the rule is firm, and check-in staff and screeners both enforce it.
Capacity is measured in watt-hours, not the mAh number printed on the front. The good news is that almost every everyday power bank sits well under the limit. A typical 10,000mAh unit is around 37Wh, and a 20,000mAh one about 74Wh, both comfortably below the 100Wh line where things stay simple.
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| Battery capacity | What it means |
|---|---|
| Under 100Wh (most phones, laptops, power banks) | Carry-on, no airline approval needed |
| 100Wh to 160Wh | Carry-on, but you need airline approval first. Usually capped at two |
| Over 160Wh | Not allowed on board at all (rare medical device exceptions aside) |
| Damaged or swollen batteries | Leave them at home. Screeners can reject them on the spot |
One trap that catches people out: gate-checks. If your cabin bag gets taken at the gate and sent to the hold on a busy flight, you have to take your power banks and spare batteries out first and keep them on you. So don’t bury them at the bottom of the bag. Keep them in the small personal item that stays with you under the seat.
Related Article: There’s a lot more nuance to flying with portable chargers, so I put it all in one place. Have a read of my guide to power banks on planes before you pack yours.
What you can and can't pack
Beyond liquids and batteries, there’s a longer list of items that live in the “carry-on or checked?” grey zone. A lot of things you can’t bring through the checkpoint are perfectly fine in your checked bag, which trips people up. The instinct is to assume “banned” means “banned everywhere,” and mostly it doesn’t.
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| Item | Carry-on | Checked bag |
|---|---|---|
| Pocket knives, larger scissors, blades | No | Yes (packed safely) |
| Full-size toiletries over 100ml | No | Yes |
| Power banks and spare lithium batteries | Yes | No |
| Firearms | No | Yes, if unloaded, locked in a hard case and declared |
| Sports gear (bats, clubs, poles) | No | Yes |
| Common lighter | Usually one, on you | Restricted |
The one that trips up a surprising number of law-abiding travellers is the firearm rule. Bringing a gun to a US checkpoint in your carry-on, even by accident, is a serious business with hefty fines attached. If you’re travelling with one legally, it goes unloaded, in a locked hard case, in your checked bag, and you declare it at check-in. If you’re not sure something’s allowed at all, don’t risk it. Pack it in the hold or leave it behind.
Small print: Individual airlines can be stricter than the checkpoint rules, and other countries have their own lists. If you’re connecting internationally, check the rules for every leg, not just your US departure.
PreCheck, Global Entry and CLEAR: the skip-the-line options
If you fly through US airports even a couple of times a year, one of these programmes can turn security from a slog into a two-minute walk-through. They do different jobs, though, and it’s easy to buy the wrong one.
TSA PreCheck is the airport-security one. You get a dedicated lane, you keep your shoes, belt and light jacket on, and your laptop and liquids stay in the bag. It’s for domestic flights and it covers kids under 18 travelling with you.
Global Entry does everything PreCheck does and speeds you through customs when you land back in the US from abroad. If you fly internationally even once during the membership, it’s usually the smarter buy, and it only costs a bit more. The one after a long-haul flight, when you’re knackered and staring down a huge customs hall, is when you’ll be glad you have it.
CLEAR is a different thing again. It’s a private service that gets you through the identity check faster using biometrics, and it runs on an annual subscription rather than a one-off fee. Some people pair it with PreCheck. For most travellers it’s the least essential of the three.
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| Programme | Rough cost | Best for |
|---|---|---|
| TSA PreCheck | About $78 / £62 / €72 for 5 years | Domestic flyers who want faster security |
| Global Entry | About $120 / £95 / €110 for 5 years | Anyone flying internationally (includes PreCheck) |
| CLEAR Plus | About $209 / £165 / €192 a year | Frequent flyers at CLEAR airports who want the ID lane |
Prices are a guide and vary by provider and enrolment route. Here’s the bit that makes people happy: a lot of travel credit cards refund the PreCheck or Global Entry fee as a statement credit, which effectively makes it free. Check what your card offers before you pay out of pocket, because there’s a decent chance you’re already covered.
Money saver: Don’t pay for PreCheck if you might travel abroad within five years. Buy Global Entry instead. It includes PreCheck anyway, so paying for the smaller programme first just means paying twice.
Medications, baby gear and travelling with kids
Family travel through US security is a lot less painful than it used to be, but a few specifics are worth having straight so you’re not improvising at the belt with a toddler melting down beside you.
Medications, as covered earlier, don’t have to squeeze into your quart bag. Liquid medicines, in reasonable quantities for the trip, are allowed over the standard limit. Keep them accessible and mention them to the officer. Same for baby formula, breast milk and juice for little ones. You bring what the baby needs, you flag it, and it gets screened separately.
Kids don’t need ID when flying domestically with an adult, and children can go through a PreCheck lane with a parent who has it. Little practical things smooth the whole thing out: wear slip-on shoes for anyone who might still get asked to remove them, keep snacks in an outer pocket, and pack the nappies and wipes where you can reach them without unloading the entire bag.
Related Article: Packing for a family trip is a whole skill in itself, and overpacking for kids is real. My family packing list breaks it down by age and trip length so you bring what you’ll actually use.
How to get through security faster
You can’t control the queue, but you can control how quickly you personally clear it. A few habits that genuinely help:
- Have your ID and boarding pass out and ready before you reach the podium. Fumbling for them is the classic hold-up.
- Empty your pockets into your bag before you’re at the belt, not while standing on the mat. Phone, coins, keys, all of it.
- Keep your liquids bag and laptop near the top of your carry-on so you can grab them in one move if the lane needs it.
- Wear a jacket you can shrug off in a second, and skip the belt with the enormous metal buckle on a fly day.
- Check your power bank’s watt-hour rating at home so there’s no debate at the machine.
None of it is rocket science. But the difference between a smooth traveller and a slow one at the checkpoint is almost always just preparation, and being the smooth one feels great when you’re the one already sitting at the gate with a coffee.
Reality check: Even a spotless run through security won’t save you from a delayed flight. If a hold-up is the airline’s fault, you may be owed money on many routes. It’s worth checking a flight compensation service rather than assuming there’s nothing to claim.
Final Thoughts
US airport security has genuinely got easier in the last little while. Shoes stay on, the newer scanners let you leave your laptop and liquids packed at more and more checkpoints, and the whole thing moves quicker than the version most of us grew to dread. The two things that can still catch you out are the ones worth sorting in advance: the right ID in your pocket, and your liquids and batteries packed the way the rules want them.
Get those squared away, turn up with a bit of time to spare, and the checkpoint becomes the boring bit of the journey it should be. Which is exactly what you want, because the fun part is on the other side.
Before you go, two things that make any US trip smoother. Sort proper travel insurance so a delay, a lost bag or a medical wobble doesn’t turn into a financial one, and if you want a full itinerary sorted, browse the tours at your destination so you land with a plan rather than a panic. Safe travels.
FAQs
Can I bring a full-size deodorant or toothpaste in my carry-on?
It depends on the type. A solid deodorant stick doesn’t count as a liquid, so bring any size you like. A gel or spray deodorant and any toothpaste do count, so they have to be 3.4oz (100ml) or under and fit in your quart bag. Full-size versions go in your checked bag.
Do I need a passport to fly domestically within the US?
Not if you have a REAL ID-compliant licence (the one with the star). If your licence isn’t compliant, a valid passport or passport card works as your accepted ID. International visitors will be flying on their passport anyway, so you’re already sorted.
Can I take food through TSA security?
Solid foods are fine. Sandwiches, snacks, fruit, crisps, all good to go through in your carry-on. The catch is anything spreadable or pourable. Peanut butter, honey, yoghurt and soft cheeses count as liquids, so they have to obey the 3-1-1 limit.
Is TSA PreCheck worth it?
If you fly domestically more than a couple of times a year and dislike the standard lines, yes. You keep your shoes and belt on and leave your laptop and liquids packed, which adds up over five years of membership. And if you ever fly internationally, Global Entry is the better buy since it includes PreCheck.
What happens if I accidentally pack a power bank in my checked bag?
If it’s spotted during baggage screening, it’ll be pulled out and you usually won’t get it back. To avoid the whole thing, always keep power banks and spare batteries in your carry-on or personal item, and don’t bury them in case your cabin bag gets gate-checked to the hold.
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Nick Harvey
Hi, I am Nick! Thank you for reading! The Travel Tinker is a resource designed to help you navigate the beauty of travel! Tinkering your plans as you browse!
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