If a plane lands on shabbos, is there a tchum issue? Do we pasken יש תחום למעלה מעשרה?
I believe we do, but I think we pasken that you can't be koneh shvisa while moving, so you are koneh once the plane come to a stop, and then you will have the techum of the airport, as most airports don't have residential structures within 70 amos.
Now if you are a poshea, you either get 4 amos, or the building (don't remember the conditions)
ETA: I think you have 4 amos, but if you are forced out of the 4 amos (just waiting until someone tells you you have to deboard now may be enough) then you get the building. If you voluntarily deboard then you continue to only have 4 amos no matter where you go