Pair on airship Los Angeles 1925 Lakehurst-Bermuda flight (LZ126) flight, violet private postal marking indicating route. Appropriate cancel and and receiving mark. Minor envelope faults.(Sieger 20N €85)

Two covers with boxed purple "Via Air Mail, On first trip of through schedule involving night flying on Transcontinental Air Mail Route". Both with winged US Air Mail markings also. C4 cover has a Kimball, Nebr., July, 1 1924 CDS. The C6 is tied with a Reno, Nev., July 1, 1924 CDS. Both stamps are FVF. (Est $60-100)

Scott C13 (x2) and C14 on 1930 First Europe Pan-American Zeppelin Flight. Stamp combination pays round trip rate. Appropriate Special Confirmation postmarks (Type I) and faint receiving postmarks on back. Stiff, dark envelope in excellent condition. (Est $450-600)

First Europe Pan-American Zeppelin Flight. April 29, 1930 Varick St. Sta. CDS. Clearly struck Special Confirmation postmarks. Graf Zeppelin depicted on the face of the envelope. A few minor envelope faults and a tiny tear at the top that do not detract. (Sieger 64C €900)

Century of Progress 1933 Graf Zeppelin Miami to Chicago flight. Appropriate Special Confirmation and receiving postmarks. Attractive example with an interesting Zeppelin related Miami Chamber of Commerce backstamp. Gum line toning on back. F-VF (Sieger 242B €175)

Century of Progress 1933 Graf Zeppelin Chicago to Akron Flight. Attractive cachet of the "German-American Group of the Chicago World's Fair Welcomes Dr. Eckener and his Graf Zeppelin". Proper special confirmation postmark and receiving CDS on the back. Cover has small tears at the top and is repaired with tape on the back. Small portion on tape can be seen on the face. Baby Zepp stamp is F-VF. (Sieger 244A, €200)

Century of Progress 1933 Graf Zeppelin Chicago to Friedrichshafen flight. Special Confirmation postmark and receiving postmark. Minor toning on back. (Sieger 244C €175)

Pair on 1922 cover sent to Washington DC, 1922. VF. Stamp(s) on cover unpriced in Scott.