my suggestion is, roll a joint, put it in a sammich baggie, duct tape it real good, get it wet, roll it in jalepeno powder, duct tape it some more and between the ass cheeks with it. roll a couple if its a long flight. also, i suggest you take a box of matches because they dont let you take lighters on anymore and a wide straw. now let me break it down for you.
in the bathroom sink on the left side of the bowl you will see an octogon of holes. light a match and hold it close to these holes, if the flame gets sucked in your good to go. if not, dont even attempt the following.
1. light your joint and always keep it close to these holes, also, you might want to check the room for cameras before you do anything, just in case.

2.take your hits by craning your head down to meet you joint by these holes, always keeping the joint very close to them.

3. i assume youve had that straw out of your pocket and in your hand? good boy. blow the smoke through the straw and into the holes

repeat until finished.
on a side note, if you want to kill some time you can always clean the bathroom, make it spotless ya know?
if you dont follow these instructions and somehow mess up, the hyper sensitive smoke alarm in the bathroom will go off, in that case, you will need to flush everything down the toilet and deny, deny, deny, always deny, no matter what.