A passenger puts his/her arms (and sometimes head) onto the seat and kneels in the leg space, keeping butt in the air. Occasionally happens on long flights, as a way to alleviate discomfort caused by sitting in a conventional pose for a long time.
"My back was hurting like hell on the red-eye to Chicago last night, so I assumed the inflight doggy style position"
by angryprofessor February 10, 2014