A thousand swollen feet suddenly uncrammed from sweaty leather sheaths, combined with lack of air flow and food that looks like it was slopped from the same steam tray into which the airline toilets empty: vomiting in an airplane is unpleasant, if perhaps unavoidable. With cramped aisles, sleeping neighbors and little leg-room, you usually don’t have time to make it to one of the small tin-closet lavatories, leaving your only recourse ballooning your cheeks, then swallowing… or the dreaded barf bag.