Originally Posted by
Matthew Bennion
I have a booking for the 13th March. Just changed the date and it unlocks Check In via the app. However, after clicking the button it then fails (Internet check-in not possible -Please contact manual check-in at the airport). So as you say, some backend system has to be open also. But that may happen from T-72 or less perhaps. Will do some testing in the days towards this booking to find out!
My guess would be that it opens somewhere in the 48 to 32 hour range. But really just a guess.