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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
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