sentences:  Prior to this admission, there was never any mention of a Watson built glider, neither by James, the eyewitnesses James presented in support of his original claim, nor significantly, by Preston Watson himself.Exactly when Preston Watson carried out his first flights in this aircraft is the crux of the matter in the eyes of James Watson's supporters.For any claimant to powered flight earlier than the Wrights, the date of the Wright's first powered flight (17 December 1903) is when such flights must pre-date.