1939 Event 1st regular transatlantic airmail (New York to Marsseille France) 1937 Event 1st airmail letter to circle globe returns to New York 1935 Event China Clipper (flying boat) took off from Alameda, California, carrying 100,000 pieces of mail on 1st trans-Pacific airmail flight 1934 Event Helen Richey becomes 1st woman to pilot an airmail transport 1924 Event Through regular transcontinental airmail service forms, New York City-SF 1923 Event Transcontinental airmail service begins 1920 Event 1st transcontinental airmail flight from New York to SF 1918 Event 1st airmail postal service (New York, Philadelphia and Washington D.C.) 1918 Event 1st regular airmail service (between New York and Washington) inaugurated 1918 Event 1st U.S. airmail stamps issued (24 cents )
