Originally Posted by
YVRtoYYZ
Twitter AC first as that footrest is not permitted on many airlines.
IME travelling on AC and UA it very much is up to the FA and SDs serving you, where you are seated and when you decide to deploy such a contraption. Supposing you are seated in a non emergency exit row then I would recommend inflating the contraption when you've climbed and the seat belt sign goes off, and then deflate and stow the "furniture" about 30 minutes prior to arrival. That being said, I've sat in emergency exit rows and have had stuff scattered about the row whilst the plane was at altitude.
Originally Posted by
Academic
I don't see why there would be any problem. Lots of people use similar items. As long as it isn't a full-size air mattress you should be OK
Indeed, bring your own full-sized air mattresses is an option reserved for customers in business aka Signature Service
-James