Why can’t I check in online?
TUI fly: The online check-in can be closed for various reasons for certain destination. You don´t have to worry You can also check-in at the airport.
Passengers traveling with a pet in cabin (including fellow passengers) will soon not be able to check-in online and log in for seat reservation and because they are required to be window-seated for security reasons and may only check in at the airport itself. The seat reservation will be automatically assigned by the preseating system only shortly before departure.