1918 New York to Boston 6th June Experimental flight, flown aerial league of America air mail cover. Lt Webb made this sucessful trip. The mail was at the 24 cent rate with C3 Carmine and Blue stamp postmarked 3rd June 1918 first trip Air Mail Services. Has Via Aeroplane mail cachet and 6th June Boston Mass receiving mark. A scarce and highly collectable piece of very early aviation memorabilia.