Passenger has wild ‘raw dogging’ hack to pass time on airplanes — and other travelers love it, too: ‘I do this a lot’ By . Taylor Knight.

From supersonic giants to double-decked monsters and flying cities, this list explores 15 commercial aircraft that were designed but never made it off the drawing board. Featuring designs like the ...

An aircraft has to go through a variety of safety tests and certifications, which can easily take several years. ... then you do have to come up with these completely wild ideas,” he says.