air pocket
noun [ C ] uk/ˈeə ˌpɒk.ɪt/ us/ˈer ˌpɑː.kɪt/
（大气中可引起飞机急速上升或下降的）气阱，气穴
an area in the sky where the air is flowing differently from the way it is in the surrounding parts. Air pockets can sometimes cause aircraft to go up or down suddenly.
See also: pocket noun