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Which papers a traveller needs is decided by numbers — stay limits, application windows and passport validity — and all of them are checked before a ticket is issued, not at the airport.
The Schengen short-stay rule is the cleanest example of stay arithmetic. The visa allows a maximum of 90 days within any rolling 180-day period: on each day of the trip, count back 180 days and total the days spent in the zone — the sum may not pass 90.
The application window is just as fixed. A Schengen visa file can be submitted at the earliest six months before departure and no later than 15 days before it. Filing inside the last two weeks is not a late application; it is no application at all.
On narrow screens, swipe or scroll the plate sideways.
Passport validity is the third check. Many destinations require the passport to remain valid beyond the date of entry, so a passport that expires shortly after the trip can fail the check even when the visa is fine. The name on the ticket must also match the passport exactly.
These checks sit inside the booking chain at step four, before payment — the sequence is laid out on How a Flight Booking Is Made (/flight-bookings). A ticket issued against papers that later fail becomes a refund problem, and refund outcomes depend on the fare rules covered on Flight Changes and Refunds Explained (/changes-and-refunds).
None of these windows is negotiable at the airport. Check-in staff apply the destination's entry rules because the carrier pays for returning a refused passenger, which is why the checklist below is run while the booking is still just a PNR.
Further reading