Zeppelin Flights. 1938, red or black overprints ''Sandjak D'Alexandrette'' on air post stamps of Syria, ½ p-25p, complete set of eight, blocks of four, full OG, NH, VF, C.v. $900, Est. $300-$400 (Image)

Pioneer Flights. 1929- 37, four items, direct and return flights pre-printed covers on line ''Brisbane - Charleville'' (April 17-22, 1929), each one signed by Pilot Captain P.H. Moody; FFC from Rabaul to Sydney (1933) and flown cover within New Guinea from Wau to Salamaua (1937), appropriate markings, VF, Est. $200-$250 (Image)

Pioneer Flights. GROUP OF AERIAL POSTAL HISTORY ITEMS: 1930-46, 15 cards or covers, representing 9 from Belgium, 2 with mixed franking of Belgium and Belgian Congo and 4 of Belgian Congo, generally various Sabena Flights to/from Leopoldville and two Air France covers of Belgium origin, occasional flaws possible, generally F/VF, Est. $300-$400 (Image)

Pioneers of Aviation. 1905-06, two black-and- white postcards, representing Giant Balloons, one is commemorating 75th Anniversary of Belgian Independence, produced by Louis Capazza, the other one- on Brasschaat Ground with balloonists who made it, sent from Brussels to Uccle or Liege, both are VF and scarce, Est. $150-$180 (Image)

1927, Syndicato Condor, 500r-10,000r, complete set of seven, full OG, NH, VF. C.v. $109 (Image)

Pioneer Flights. 1931-37, 6 covers, Dornier Do X Flying Boat Europe - South America Flight of 1931, two Zeppelin Flight items of 1934 and 1936, three Condor - Lufthansa Flights to Europe, all appropriate markings, generally F/VF condition, Est. $200-$250 (Image)

1926, Elliot-Fairchild Air Service, (25c) red on yellow background of swastika, complete pane of eight, occasional separation on margins only, full OG, NH, VF, C.v. $400 as singles, Unitrade C.v. CAD$675, Est. $150- $180 (Image)

1927, Yukon Airways and Exploration Co. Ltd, reversed image die proof of 25c in black, printed on thick card, size 98x75mm, perfect condition, no gum as produced, NH, VF, Unitrade C.v. CAD$450, Est. $100-$120 (Image)

1929, Commercial Airways, Ltd. ''VIA AIR'', (10c) black, pane of ten (no side selvage), stamp on position 2 with broken second ''C'' in ''COMMERCIAL'', full OG, NH, VF and rare multiple, C.v. $1,800++, Unitrade C.v. CAD$2,520, both catalog values as singles, Est. $600-$700 (Image)

1929, Commercial Airways, Ltd., ''VIA AIR'', imperforate trial color proofs of (10c) in green, light carmine, yellow and orange, each one has bottom right corner margin, printed on thin white card, no gum as issued, NH, VF, Unitrade #CL47ii, C.v. CAD$1,200, Est. $300-$350 (Image)

Pioneer Flights. 1924-31, 5 items, Advertising cover Estevan-Winnipeg (1924), pioneer flight Allen Water-Pickle Lake (franked on reverse by CL40, 1929), first flight cover Grand Prairie-Edmonton (#CL47, 1929), first flight Edmonton-Fort Mc. Murray (#CL49, 1930), first flight Athabasca-Edmonton (#CL48, 1931), all appropriate confirmation markings and arrival ds, mostly VF, Est. $250-$300 (Image)

1919-21, Alcock and Brown Flight, black surcharge $1 on 15c scarlet, and Halifax Airmail, black surcharge with period after ''1921'' $1 on 35c red, nicely centered, large part of OG, VF, C.v. $370, Unitrade C.v. CAD$550, Est. $120-$150 (Image)

TWO-PAGE COLLECTION OF AIR POST ISSUES: 1931-43, both Pictorial sets, Dornier Flight surcharge, Labrador issue, Balbo Flight surcharge and St. John's, 15 mint stamps on well-described heavy duty pages, all with full OG, LH or hinged, VF, C.v.$1,029, Unitrade C.v. CAD$1,461, Est. $300-$350 (Image)

1931 (June 6), C.N.A.C. Pioneer Flight cover on line Tientsin - Beijing, then via Siberia to Europe, addressed to Great Britain, franked by seven stamps of the 2nd Peking printing, including three of $1 values, tied by special flight circular markings, bearing red Berlin Zentral Luftpostamt transit handstamp, vertical fold, still F/VF and rare, Est. $300-$400 (Image)

1920, Compania Colombiana, 10c green, bottom left corner margin block of four containing two vertical se-tenant pairs, no gum as produced, NH, VF, C.v. $260++, Est. $100-$120 (Image)

1920, First Air Post issue, six proofs of Airplane surcharges on blank pieces, black and red of 14k on white paper, black of 24k on cream paper, two black and one green of 28k, two on white and one on cream paper, no gum as issued, VF and rare, two with experts' hs on reverse, Est. $250-$300 (Image)

1922, Second Air Post issue, six proofs of Airplane surcharges on blank pieces, three in black of 50(h) on creamy thin card, on creamy paper and on creamy piece from an old poster; one in black of 100(h) on creamy thin card (small spot of paper scratch on reverse); two of 250 (h) in black or blue on thin cards, no gum as issued, mostly VF and scarce, four with experts' sign on reverse, Est. $250-$300 (Image)

Zeppelin Flights. 1928 (October 11-15), America Flight cover franked by left sheet margin horizontal pair of Airplane over Danzig 2½ g, tied by oval ''4.10.28'' date stamp, blue oval confirmation marking and NYC ''16.OCT.1928'' receiver, VF and scarce, Sieger #21, C.v. €650, Est. $250-$300 (Image)

Zeppelin Flights. 1933 (May 6-10), 1st SAF cover from Danzig to Brazil, mixed franking of five Danzig (one - on reverse) and one German stamps, red Berlin-Friedrichshafen connection, blue confirmation cachet and Rio de Janeiro ''10.MAI.33'' arrival marking, VF, Sieger #202 var, Est. $200-$250 (Image)

1929, red surcharge with ''Provisional'' at 41 degree angle 75c on Colombia Air Post 15c carmine, block of four, full OG, NH, VF, C.v. $900 as hinged singles, Est. $500-$600 (Image)

1939, First Bolivarian Games, 5c-2s, complete set of five, blocks of four, full OG, NH, VF, C.v. $183 (Image)

Zeppelin Flights. 1924 (October 10-15), First America Flight by L.Z.126 (ZR 3), three postcards and one cover, franked by Carrier Pigeon stamps, all but one cancelled Friedrichshafen ''15.SEP.24'' and bearing additional ''10.OKT.24'' date stamp, violet confirmation cachet, all different ''MIT LUFTPOST'' labels in black on gray green paper, all appropriate markings and NYC ''OCT.15.1924'' arrival hs, mostly VF, Est. $200-$250 (Image)

Zeppelin Flights. 1933 (May 6-10), 1st SAF cover to Brazil, nicely franked by 14 values, including two North Pole overprints and five positional se-tenants, cancelled on board, blue confirmation cachet and Pernambuco ''9.V.33'' arrival ds, VF and rare franking, Sieger #202, Est. $250-$300 (Image)

Zeppelin Flights. 1933 (October 14 - November 2), Chicago (Century of Progress) Round Flight registered cover from Lübz, franked by Zeppelin complete set specially issued for this flight, red triangle flight cachet, hexagonal connection in red, Friedrichshafen arrival ds in green on reverse along with advertising label, mostly VF and scarce complete set franking, Sieger #238D, C.v. €1,425, Est. $600-$700 (Image)

Zeppelin Flights. 1936 (August 1), Airship Hindenburg Olympic Flight cover, franked by complete Berlin Summer Olympic Games set of eight, tied by Frankfurt special marking, the same day Berlin arrival ds on reverse, mostly VF, Sieger #427Ab, C.v. €330, Est. $150-$180 (Image)