Check-in mistakes to avoid

1. Screenshotting the app boarding pass

The number-one mistake. The live app pass updates when the gate changes. Your screenshot doesn't. You arrive at the old gate, the flight has already started boarding 200m away, and the screenshot shows an outdated gate number. On Ryanair specifically, the screenshot is also officially refused.

Fix: add the pass to Apple Wallet or Google Wallet. Both auto-update. The screenshot is at most a fallback if your phone is dying.

2. Paying for "priority boarding" without realising you already have it

If you booked a "Plus" or "Bundle" fare on Ryanair / Wizz / easyJet, priority boarding is included. The check-in upsell screen aggressively offers it again as if you didn't. You can pay €8 a second time without noticing.

Fix: read the fare summary at booking. The included items are listed there. At check-in, click straight through any "add priority" upsell.

3. Cabin bag size — the gauge surprise

Low-cost carriers enforce cabin bag dimensions strictly. The metal frame at boarding is the test. If your bag doesn't fit, it goes in the hold for €50–€90 on the spot. The fees are the airline's profit centre.

Common mismatches:

• Wheels and handles count. A bag advertised as 55x40x20cm with the wheels often measures 56x42x22 — fails the gauge.
• Soft bags vs hard. A bulging soft bag at 21cm depth fails as harshly as a hard 22cm.
• "Underseat only" fares. Ryanair's basic fare is one underseat bag (40x20x25). Anything bigger costs.

Fix: measure the empty bag at home before flying. If it's borderline, take it to the airport empty/half-packed. Most airlines sell a "small bag" carry-on add-on for €8–€15 at booking — far cheaper than the gate fee.

4. Booking the wrong-airline boarding pass for a codeshare

You booked Lufthansa LH9876, but the operating carrier is United. You log in to Lufthansa, the system politely points to United, but you don't see the message. You arrive at the airport without a boarding pass and find the United desk closed.

Fix: when the booking confirmation says "operated by [other]", check in on the operating carrier's site. Use the booking reference from your email — it might differ from the marketing carrier's. See connecting flights for the full rundown.

5. Missing the destination's electronic travel authorisation

If you're flying to the US (ESTA), Canada (eTA), UK (ETA from 2026), Australia (ETA), New Zealand (NZeTA), South Korea (K-ETA), or Schengen post-2025 (ETIAS), you need to apply before the flight.

The airline's system queries the relevant authority during check-in. If your authorisation isn't approved, you don't get a boarding pass. Some applications return in minutes; others can take 72 hours.

Fix: apply at least a week before flying. Use the official government site only (e.g., esta.cbp.dhs.gov for US, canada.ca for Canada). Third-party sites charge 4–8x the official fee.

6. Picking a "free" seat that isn't

On many low-cost carriers, "random" seat assignment at check-in is free, but every specific seat is paid — including any with extra legroom, any in the front, or any window/aisle. The cheapest paid seat is often €5–€8, but exit rows and bulkhead can be €25+.

The trap: the seat map's free seats are typically only ~10% of the plane, often in awful positions (last row, middle seat between strangers). Expecting "free" to mean "no fee" leads to paying €15 for the cheapest non-disastrous option.

Fix: if you don't care where you sit, click "skip seat selection" at booking and again at check-in. Random assignment is free and usually fine.

7. Believing online check-in always saves money

Most carriers reward online check-in by offering free seat selection or skipping the airport queue. A few — most loudly Ryanair, easyJet, Wizz — make it the cheapest path but add penalty fees if you don't. Airport check-in fees on those three are €30–€55.

Conversely, full-service carriers like Lufthansa, BA, Air France, KLM make airport check-in free. There's no penalty; the online flow is just faster.

Fix: read the fare's terms at booking. The penalty fee is in there.

8. Forgetting to drop bags after online check-in

Online check-in produces a boarding pass; it does not handle the hold bag. If you have a bag, you still need to drop it before the bag-drop cutoff. Some passengers see "checked in!" and head straight to security, then realise on the way that their suitcase needs to be at the desk.

Fix: if you have a hold bag, plan: arrive at the airport, go to bag drop first, then security. Most airlines have a dedicated "bag drop only" lane that's much faster than full check-in.

9. Letting Wallet auto-add the wrong-day pass

Some airlines push two passes if you have two flights — outbound and return — and Wallet sometimes auto-shows the wrong one. You walk to security with the return flight on screen, the gate scanner rejects it, the queue piles up.

Fix: open Wallet and verify the date and flight number before queueing. Lock the screen on the right pass.

10. Using nicknames or shortened names

"Bill" instead of "William" on the booking. The passport says "William" — the airline's system rejects. This is one of the most common name-mismatch causes for native English speakers.

Fix: always book under the full name as printed in the passport, including all middle names. If you've already booked under a nickname, fix it before check-in via "manage booking" or call the airline (small typo corrections are usually free).

11. Trusting the email confirmation as a boarding pass

The booking confirmation is not a boarding pass. It has the booking reference, but no barcode that scans at the gate. We've seen passengers swipe their email at the bag-drop kiosk expecting it to work.

Fix: the boarding pass arrives after you complete online check-in, as a separate email or app screen. It has a 2D barcode (PDF417 or Aztec) — that's the thing the gate scanner reads.

12. Skipping check-in because you have status

Some elite passengers assume they don't need to check in online — the system will auto-issue a boarding pass at airport check-in. Sometimes true. But on low-cost carriers and partner-operated codeshares, it's not always automatic, and you face the airport check-in fee or a manual desk visit.

Fix: always run online check-in even with status. It's 30 seconds and removes any risk.

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