A flight delayed for more than 3-hours is subject to late plane compensation under European Law, but when has a plane landed? Germanwings definition was when a plane has landed, however, the German Court has determined that a plane has landed when the doors are opened. The ruling came because a flight landed 2 hours and 58 minutes late but the doors opened after 3-hours.
A couple of minutes suddenly makes a massive difference. Under European Union law a consumer can claim compensation for European flights or long-haul international flights where they are over 3-hours late. The airlines fight these cases tooth and nail because of the potential financial impact to their businesses.