The fact is that Airnimals CAN fit into an airline checkable suitcase, believe it or not. Sure it takes much longer than a Brompton, but it's a totally different bike, and how frequently really do you take your bike on a plane with you? Even if it was every week it wouldn't be too much hassle. I would imagine that you're probably flying just a few times a year, so it shouldn't cause too much of an issue, its simple enough.