Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - 1918 (September 5-7), First Experimental Flight NYC - Chicago by Army pilots M. Miller and E. Gardner, cover franked by 16c green, tied by oval violet ''N.Y. - Chic. Aero Mail 9.5.1918. First Trip'' marking, Blue Wings ''Aero Mail'', Chicago arrival ds on reverse, minor conveyance flaws, still F/VF, Est. $250-$300, Sc. # C2