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.

Alaska Airlines is removing kiosks that print passengers' boarding passes and telling people to download or print them. The airline has already removed kiosks at nine airports so far.

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.