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The editor writes… An aircraft must keep up a certain airspeed to stop it stalling. But when flying into a headwind, it can reduce its ground speed without fear of falling. These facts were stressed by Clive Teale in a correction to our question Plane Thinking on 23 March. The correspondent he was correcting, Len Winokur, had actually made the same point, but his answer was sent off course by the word-traffic controller at the Last Word. Apologies to Len for the error.