Thought about it years ago. 1) takes up a large amount of carry on. 2) Might work in wider First seats but difficult to use in narrow business seat beds. 3) I do not find them any better than the Casper thing you get in F. Only F I find really comfortable is JAL. Still flying TATL to LAX on a77W and looking forward to it. I know it is childish but I love looking out over Canada from swivel seats.