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There have been reports that a drone hit a plane on its way into Heathrow. Investigators say there is so little evidence either way it is not possible to say whether it really was a drone, but either way, the story has raised concerns. Dr Adam Rutherford spoke to Dr Sue Wolfe of ARPAS, to find out how our increasingly crowded air space is regulated. First broadcast on Â鶹Éç Inside Science, 29 April 2016.