They glide on, the enormous multi-engined passenger jets, for thirty, forty-five minutes, only to smash themselves up when they attempt a landing.

它们，那些庞大的多引擎的客机，会继续滑行三、四十分钟，只是在它们企图着陆时才撞毁的。

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However, multi-engined aircraft - like the one that crashed - can be provided with ATC clearance to fly elsewhere in the London Control Zone.

BBC: London helicopter crash: What are the rules for pilots?

SpaceX was quick to make the point that the ability to carry on despite an engine failure demonstrates a big advantage of multi-engined rockets like the Falcon (Space Shuttles and Saturn V moon rockets could both do something similar).

ECONOMIST: SpaceX goes to the ISS