Mobile boarding passes are acceptable for flights except from Moroccan airports, where passengers must have a paper print-out.

Millions of people are expected to go on holidays this summer - and it's important to be aware of the rules before you do ...

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.

Mobile boarding passes are acceptable for flights except from Moroccan airports, where passengers must have a paper print-out. Passengers who have not checked in can do so on payment of a fee.