Online/app check in available from 24 hours before departure. “If you lose or forget your boarding pass, you can print it again at a check-in kiosk at the airport,” says British Airways.

Flyers may begin checking in online — and printing boarding passes — 24 hours before a flight, but not before, because that's when airlines release free seats.

Should you find the $5 fee offensive, simply check in and print your pass at home! Or, if you must, you'll soon be able to print your pass at a self check-in kiosk for a mere $1.

Starting today, Sept. 2, it will cost Allegiant Air customers $5 to have a ticket agent print out a boarding pass at the airport.

Have an iPhone? Obtaining and storing your boarding pass via Apple Wallet will result in one less item on your to-do list at the airport. Here's how to do it.

Online/app check in available from 24 hours before departure. “If you lose or forget your boarding pass, you can print it again at a check-in kiosk at the airport,” says British Airways.