Next up could be the Boeing Pelican, an experimental concept aircraft from Boeing Phantom Works that makes everything else seem small.

FORBES: The World's Biggest Planes

Also in design: the Fozzie, a concept plane by Boeing Phantom Works.

FORBES: The World's Biggest Planes

"The neat, gee-whiz part is thinking about what would the vehicle itself look like, " said Dick Paul, a vice president with Phantom Works, Boeing's research and development arm.

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In addition it is preparing for the start of production of the Phantom Series II and has begun expansion works at its Goodwood site in West Sussex.

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