A pane of twenty stamps (ten designs) entitled American Advances in Aviation build on the popular Classic American Aircraft collection issued in 1997. Aircraft chosen for this new stamp pane illustrate American innovations and technological contributions to military, commercial, and general aviation during the 1930s, '40s and '50s. The following ten aircraft are featured on stamps:

Boeing's 247 and B-29 Superfortress;
Consolidated's PBY Catalina and B-24 Liberator;
Lockheed's P-80 Shooting Star;
Grumman's F6F Hellcat;
Republic's P-47 Thunderbolt;
Northrop's YB-49 Flying Wing;
Engineering and Research Corporation's Ercoupe 415; and
Beechcraft's 35 Bonanza.
Depicted in the header illustration are the Hughes H-1 racer and Boeing's YB-52 Stratofortress.

All are military but the classic V tail bonanza and my favorite way ahead of its time Ercoupe.

Yeah Ercoupe.