1911, Oct. 17-20, Minneapolis Minn.-Rock Island Ill. Mississippi River Flight (AAMC 6b). 2c Carmine, s.e. at left, tied by "Minneapolis, Minn. Oct. 11 6:30PM" machine cancel on cover to Red Wing Minn., with violet "Delivered by Hyro-Areo Plane Route From Winona" two-line handstamp and manuscript "c/o Hugh Robinson Hydro Aeroplane Route" at lower left, cover with rounded corners, otherwise Fine, the pilot, Hugh Robinson, was scheduled to stop in Red Wing, but he missed the stop either due to poor weather or simple pilot error and landed in Winona, mail was sent by truck from Red Wing to Winona to make the plane, of the 600-800 pieces reportedly flown, less than ten are known, with 2001 A.P.S. certificate

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