I quake at this ad from the future:

News Flash from 2043: UnitedDeltaVirgin announces the introduction of Economy Wing class. Passengers will enjoy the luxury of their own sleeping bag and oxygen mask while experiencing panoramic views during flight, courtesy of being bungee-corded to the wing by trained flight attendants just prior to take-off. Occasional bird strikes will provide in-flight meals during take-off and landing, and passengers are assured there will be no queues for the toilet facilities (as there are none, except of course the inside of the aforementioned sleeping bag). Fares are wonderfully cheap(ish...) of course.