Web check-in. The service is available for passengers on all Nok Air flights. The web check-in option can be completed from 48 hours up to 2 hours before the scheduled departure time. Passengers should visit the Nok Air homepage and enter their booking reference and last name. From the check in page, a passenger can choose a seat and also purchase a preferred seat with extra legroom or meal. Web check-in is available on eligible and participating domestic and some international flights . Checked-in passengers can then go directly to the boarding gate and place their baggage at the designated Check-in Counters for passengers-checking in on the web. They can then print the boarding pass once check-in has been completed, or save it to their mobile wallet or add it to Apple wallet, and produce it at the boarding gate.