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# C1 - 1918 6¢ Curtiss Jenny
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# C2 - 1918 16¢ Curtiss Jenny
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# C3 - 1918 24¢ Curtiss Jenny
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# C4 - 1923 8¢ Airplane Radiator and Propeller
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# C5 - 1923 16¢ Air Service Emblem Issue
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# C6 - 1923 24¢ DeHavilland Biplane Issue
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# C7 - 1926 10¢ Mail Planes and Map
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# C9 - 1927 20¢ Mail Planes and Map
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# C10 - 1927 10¢ Lindbergh's Plane
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# C11 - 1928 5¢ Beacon on Rocky Mountains Issue
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# C12 - 1930 5¢ Winged Globe Issue
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# C16 - 1931 5¢ Winged Globe Issue
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# C17 - 1932 8¢ Winged Globe Issue
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# C18 - 1933 50¢ Baby Graf Zeppelin Issue
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# C19 - 1934 6¢ Winged Globe Issue
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# C20 - 1935 25¢ China Clipper Over Pacific Issue
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# C21 - 1937 20¢ China Clipper Over Pacific Issue
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# C22 - 1937 50¢ China Clipper Over Pacific Issue
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# C23 - 1938 6¢ Eagle Holding Shield Olive Branch and Arrows Issue
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# C24 - 1939 30¢ Winged Globe Issue
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# C25 - 1943 6¢ Twin-Motored Transport Plane Issue
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# C26 - 1944 8¢ Twin-Motored Transport Plane Issue
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# C27 - 1941 10¢ Twin-Motored Transport Plane Issue
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# C28 - 1941 15¢ Twin-Motored Transport Plane Issue
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# C29 - 1941 20¢ Twin-Motored Transport Plane Issue
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# C30 - 1941 30¢ Twin-Motored Transport Plane Issue
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# C31 - 1941 50¢ Twin-Motored Transport Plane Issue
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# C32 - 1946 5¢ DC-4 Skymaste
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# C33 - 1946 5¢ DC-4 Skymaster
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# C34 - 1947 10¢ Pan American Union Building
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# C35 - 1947 15¢ Statue of Liberty - New York Skyline
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# C36 - 1947 25¢ San Francisco-Oakland Bay Bridge
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# C37 - 1948 5¢ Vertical Coil - DC-4 Skymaster
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# C38 - 1948 5¢ Map of 5 Boroughs
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# C39 - 1949 6¢ DC-4 Skymaster
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# C40 - 1949 6¢ Alexandria Bicentennial Issue
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# C41 - 1949 6¢ Air Mail Issue-DC-4 Skymaster - Vertical Coil
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# C42 - 1949 10¢ Universal Postal Union Issue
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# C43 - 1949 15¢ Universal Postal Union Issue-Globe and Doves
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# C44 - 1949 25¢ Universal Postal Union Issue-Boeing Stratocruiser
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# C45 - 1949 6¢ Wright Brothers Issue
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# C46 - 1952 80¢ Diamond Head, Hawaii Issue
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# C47 - 1953 6¢ Powered Flight-50th Anniversary Issue
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# C48 - 1954 4¢ Eagle In Flight Issue
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# C49 - 1957 6¢ Air Force-50th Anniversary Issue
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# C50 - 1958 5¢ Eagle in Flight Issue
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# C51 - 1958 7¢ Silhouette of Jet Airliner
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# C52 - 1958 7¢ Vertical Coil-Silhouette of Jet Airliner - Large Holes
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# C52a - 1958 7¢ Vertical Coil-Silhouette of Jet Airliner - Small Holes
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# C53 - 1959 7¢ Alaska Statehood Issue
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# C54 - 1959 7¢ Balloon Jupiter Issue
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# C55 - 1959 7¢ Hawaii Statehood Issue
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# C56 - 1959 10¢ Pan American Games Issue
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# C57 - 1960 10¢ Liberty Bell Issue
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# C58 - 1959 15¢ Statue of Liberty Issue
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# C59a - Tagged - 1966 25¢ Abraham Lincoln Issue
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# C60 - 1960 7¢ Silhouette Jet Airliner
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# C61 - 1960 7¢ Silhouette of a Jet Airliner - Horizontal Coil
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# C62 - 1961 13¢ Liberty Bell Issue
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# C63 - 1961 15¢ Statue of Liberty Issue
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# C64 - 1962 8¢ Jet Airliner Over Capitol
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# C65 - 1962 8¢ Jet Airliner Over Capitol - Horizontal Coil -
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# C66 - 1963 15¢ Montgomery Blair Issue
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# C67 - 1963 6¢ Bald Eagle Issue
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# C68 - 1963 8¢ Amelia Earhart Issue
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# C69 - 1964 8¢ Robert H. Goddard Issue
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# C73 - 1968 10¢ Air Mail Issue - Fifty-Star Runway - Horizontal Coil
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# C79 - 1973 13¢ Air Mail Issue - Winged Airmail Envelope
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# C82 - 1971 11¢ Air Mail Issue - Silhouette of Jet Airliner - Horizontal Coil
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# C83 - 1973 13¢ Air Mail Issue - Winged Airmail Envelope - Horizontal Coil
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# C85 - 1972 11¢ Olympic Games Issue-Skiing and Olympic Rings
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