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Andrew McCarthy

There is another significant issue in the case of a commercial jet, which is the fact that it isn't built to withstand the structural loads of negative-g flight. This is different from an aerobatic aircraft or fighter jet, whose fuselage and wing structures are capable of g-loads in both directions. So, in essence, the only way to roll a commercial jet is to maintain positive g forces throughout the manuver. The result is a barrel roll, where the aircraft climbs on entry and then descends while inverted. Passengers with their eyes closed wouldn't know they were upside down. Tex Johnson famously did this in the dash-80 back in the 50s. http://www.airlinereporter.com/tag/tex-johnson/

Vinnie Mirchandani

Andrew, air travel is already exciting enough with TSA and all. Glad we don't have to deal with negative-g's:)

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