1912 (Apr. 10) City to City Experimental Flight, New Orleans, La. to Baton Rouge, La., special "First City-to-City Aerial U.S. Mail Service" post card franked with 1¢ Washington (natural s.e. at right) tied by "New Orleans, La., Apr 10, 1912" duplex postmark, bold purple "U.S. Aerial Mail Service" flag cachet handstamp; some card corner wear, otherwise Very Fine. AAMC $350. AAMC No. 22a. $0 (Image)