| Lot Number: 513 | |
 | Date: 1918, Aug 14 Est. price: £35.00 Category: United States Internal Description: Washington to Philadelphia, bs Aug 15, printed cover correctly franked red/blue C3 24c, canc violet circular 'Air Mail Service Washington.N.Y.Phila./Washington/Aug 14 1918. |
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| Lot Number: 514 | |
 | Date: 1919, Jan 5 Est. price: £15.00 Category: United States Internal Description: Washington to New York, correctly franked 6c, canc Washington 'Air Mail Service Wash. N. Y. Phila. Washington/Jan 5 1919', ms 'Aeroplane Mail' |
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| Lot Number: 515 | |
 | Date: 1919, Feb 19 Est. price: £20.00 Category: United States Internal Description: New York to Arlington, plain cover franked 6c C1, tied 'New York Grand Central Sta/Feb 19' and 'GR/Cent' dumb cancel, ms 'By Aeroplane'. |
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| Lot Number: 516 | |
 | Date: 1924, Feb 12 Est. price: £10.00 Category: United States Internal Description: Chicago Air Mail Field to Portland, Or, Knights of Colombus corner cover franked 2c Harding canc violet Chicago 'Manager US Air Mail Field - Recd Maywood, Ill' clock cancel, fine similar strike verso. |
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| Lot Number: 517 | |
 | Date: 1924, Jul 1 Est. price: £15.00 Category: United States Internal Description: F/F Transcontinental Airmail Route involving night flying, flown westbound from New York to Chicago, no arrival ds, postmarked New York 1/7, plain cover addressed to Atlanta, franked correct 8c (C4) one zone rate, fine strike magenta four line boxed cachet "Via Air Mail/On first trip through schedule/involving night flying on Trans-/continental Air Mail Route", typed 'per Airmail Service/via Chicago, Ill'. |
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| Lot Number: 518 | |
 | Date: 1924, Jul 25 Est. price: £20.00 Category: United States Internal Description: US Governmental Flight , C6 24 c on plain cover, tied Philadelphia, Aug 20 to Elko, Nev, ms 'Air Mail'. Flap tear. |
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| Lot Number: 519 | |
 | Date: 1924, Oct 3 Est. price: £25.00 Category: United States Internal Description: Dayton-Cleveland International Air Races Connecting Service with Transcontinental Airmail, C4 8c on plain cover tied by Dayton Oct 3 pmk, black circular 'McCook Air Field Oct 2-3-4 hs, green five line air race cachet, violet 'Connecting With/Atlantic & European/via New York' and 'Via Air Mail' hs's. |
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| Lot Number: 520 | |
 | Date: 1924, Oct 3 Est. price: £15.00 Category: United States Internal Description: Dayton-Cleveland International Air Races Connecting Service with Transcontinental Airmail, C4 8c on plain cover tied by Dayton Oct 3 pmk, black circular 'McCook Air Field Oct 2-3-4 hs, green five line air race cachet, violet 'Connecting With/Atlantic & European/via New York' and 'Via Air Mail' hs's. |
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| Lot Number: 521 | |
 | Date: 1924, Oct 8 Est. price: £15.00 Category: United States Internal Description: Commercial airmail, Chicago to Baltimore, plain cover correctly rated 8c C4 for one zone service, red winged airmail marking. Possibly an unlisted crash cover. Pencil manuscript says "Plane returned/forwarded by rail" |
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| Lot Number: 522 | |
 | Date: 1925, Jul 1 Est. price: £10.00 Category: United States Internal Description: First Overnight Flight New York to Chicago, plain cover franked special 10c rate for this service, postmarked Chicago 1/7, addressed to Springfield, Ill, ms ' Via New York, black three line "Overnight Air Mail/First Trip July 1 - 1925/Connecting New York-Chicago", magenta 'Via Air Mail' hs. |
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