EasyJet is testing mobile boarding passes across departures from six airports including London Stansted, Edinburgh and Amsterdam.
The airline says the service for iPhone and Android devices enables travellers to check-in in under 10 seconds, download the boarding pass and store it on their phone.
The airline plans to work with airports to extend the service after the trial is completed while functionality including the ability to store multiple passes on the same device will be added.
The trial will also be extended to the mobile web to cover Windows Phone 7/8 and Blackberry devices later this year.
Apple's Passbook service has been integrated into the application which stores passes offline to avoid roaming charges and the need for wifi.
EasyJet unveiled its app in late 2011 and says it has been downloaded 4.5m times. The service now also enables users to pre-book a seat, add baggage and see hotels in their destination.
The carrier partnered with Dublin-based Mobile Travel Technologies for the app.
British Airways said late last year it was working toward integrating Passbook into its mobile app as soon as possible.