Can you spot what is different about this Boeing 747-100? If you guessed the engine attached to the upper deck -- you win. Pratt & Whitney is testing the PW1200G engine. Photo by Guy Norris.

Can you spot what is different about this Boeing 747-100? If you guessed the engine attached to the upper deck — you win. Pratt & Whitney is testing the PW1200G engine. Photo by Guy Norris.

EDITOR-IN-CHIEF & FOUNDER - SEATTLE, WA. David has written, consulted, and presented on multiple topics relating to airlines and travel since 2008. He has been quoted and written for a number of news organizations, including BBC, CNN, NBC News, Bloomberg, and others. He is passionate about sharing the complexities, the benefits, and the fun stuff of the airline business. Email me: david@airlinereporter.com

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