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Explanation: In this context, what does 'prop'mean? Support something by placing something under or againt it?
In this case, it seems to me, that the second flyer puts his plane under the plane of the asker.
The dialogue that follows is: Kontakt.
The second flyer props the first plane up.
Maya Jurt Switzerland Local time: 03:49 Native speaker of: German, French PRO pts in pair: 343