I am not sure what the point is in perpetuating this falsehood. The dimensions of the standard Brompton are 23"x22.2"x10.6" yielding the linear dimension of 23+22.2+10.6=55.8" well under the standard airline limit of 62", leaving room for walls of a container, rack and any accessories. Yes the Radical Design Chubby blows the airline limit pointlessly. The airline agents may let it through, but I returned mine, not wanting to take the risk. As to Birdy, most people that comment online appear to take it apart for flights. I did it for Bike Friday and Dahon and pretty much had enough - with this much work I could well take a regular bike along.