I think fionaw is right I have used my babywrap which is the same as a hug a bub and the only restriction was that your not allowed to use it for take off and landing and the reason is that that is time most likely to crash and need to be able to get baby out for emergency proceedures. besides I wanted to feed my baby during those times to help with her ears. whether u ff or bf it can be good to do to help them cope. I have been on about 10 flights around australia with her now and never had a problem. they make u take them out at security too which is a PITA!

Good luck