Oman Air has introduced an online check-in service.
Passengers can logon to omanair.com between three and 24 hours before departure to print off their boarding pass.
Check-in desks at Heathrow will remain open up to one before take off.
Abdullah Zantout, Oman Air's Country Manager, UK and Ireland, said: "Our new online check-in is designed to offer each customer greater convenience and a stress-free check-in experience.
"Technology plays an ever-increasing role in all our lives and we are delighted to be harnessing it to the benefit of all our customers."
The airline flies daily non-stop between London and Oman.