I think the distinction is that Uber and AirBnB both correspond to underused assets that you own and control. This deals with something that you don't price or

I think the distinction is that Uber and AirBnB both correspond to underused assets that you own and control. This deals with something that you don't price or control, and is already heavily regulated. Also, one problem is that neither weight not space on a plane are very underutilized in current airlines so if this took off airlines would either a) employ a pricing scheme that effectively kills it (e.g. pricing on weight of luggage or something) or b) increase costs to flyers to correspond to increased costs to them.