I purchased this for my 7 month old, 50 lb. puppy to ride in, in hopes that it would help her not get carsick. So far it hasn't helped. I thought if she were in a contained area, she'd lay down and not be looking out so much. I don't think this allows enough airflow if she's laying down and that might be the problem. It fits nicely in the back of my 2013 Ford Explorer, but just doesn't seem to get enough airflow as I mentioned. The closure seems escape proof and the plastic seems sturdy enough. I'm not sure I'd trust sending this in the cargo area of a plane.