Hello Jerry

As far as I can find the first Mosquito to fly in the US was the first Canadian built example, KB300 a B.VII Bomber that first flew on 24th September 1942 at Downsview and this aircraft was demonstrated at Wright Field on the 29th of October 1942.

This is according to the FABER book, ‘Mosquito’, Authors C. Martin Sharp and Michael J.F.Bowyer, ISBN 0 571 04750 5 for the hard back or ISBN 0 571 09531 3 for the soft back.

Richard