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I've just done a bit of simple maths on Chris' wonderful effort:
The plane appears to be a Dash 8-400 series (based on the ratio of the plane's length to its wingspan).
Assuming that the moon (diameter) subtends an angle of 31 arc minutes, and knowing the length of the plane (107.75 feet), the height of the plane is just on 21,000 feet.
Based on the advertised cruising speed of 602 kph for this model, the plane travels its own length every 196 mS. And given that the plane just fits comfortably in front of the moon at this distance, I estimate that Chris had a window of +/- 5 mS in which to capture the plane, and he got it right in the centre of this very narrow window. A superb effort given shutter lag and other delays.
Well done again!
Cheers, Chris
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