According to NASA, the concepts must incorporate technologies enabling large, twin-aisle passenger aircraft to achieve ambitious environmental goals.

根据NASA的计划，这一概念必需能够融合现有大型客机引擎技术，能实现双引擎客机推动，并能够达到环保效果。

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It travels at a speed of Mach 0.85, which is similar to the speed of other Boeing twin-aisle airplanes.

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As of December 31, 2011, it had a fleet of 102 aircraft comprising 81 single- aisle jet aircraft, 19 twin-aisle wide body aircraft, and 2 turboprop aircraft.

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