PIONEER FLIGHTS POSTAL RATES SCHEDULE: 1911 (September 27-30), first class postcard franked by Franklin 1c green, first class letter - vertical pair of 1c and 3rd class small size letter - a single of 1c, flown during the Air Meeting Garden City, Long Island, tied by Aeroplane Station No.1 date stamp, ''Aerial Special Despatch'' line marking in black, all mounted on exhibition page, VF and scarce group, Est. $500-$600 (Image)

1912 (February 22), First Flight postcard (Verbena Flowers) from Aeroplane Station at Oakland CA, franked by Franklin 1c green with perforation 12, mostly VF, Est. $200-$250 (Image)

1912 (November 2), stationery postcard McKinley 1c red, sent from Aerial Substation at Cuthbert, GA, addressed to Colquitt, violet line confirmation marking reads: ''Aeroplane Mail Service'', VF and scarce, only 57 items flown, Est. $300-$400 (Image)

1914 (August 31), Berger Aviation Co. black-and-white PPC (Wright Model B in flight), sent from Wilmington, NC to Danville, VA, franked by Washington 1c green with perforation 12, pinholes at corners, otherwise F/VF, probably operated by pilot Oscar A. Brindley (Image)

1918-23, Curtiss Jenny 16c dark green and 24c carmine rose and blue, DeHavilland Biplane 8c dark green and 24c carmine, all with full OG, NH (No.C2 is VLH), mostly VF, C.v. $355 (Image)

1918 (July 15), two First Flight covers Washington, DC - Philadelphia and New York - Washington, DC, the last one is reduced at left, each one franked by 16c green (new air mail rate started exactly on July 15), both mounted on page with detailed explanation, F/VF, Est. $600-$800 (Image)

1918 (September 5-7), First Experimental Flight NYC - Chicago by Army pilots M. Miller and E. Gardner, cover franked by 16c green, tied by oval violet ''N.Y. - Chic. Aero Mail 9.5.1918. First Trip'' marking, Blue Wings'' Aero Mail'', Chicago arrival ds on reverse, minor conveyance flaws, still F/VF, Est. $300-$400 (Image)

FIRST INTERNATIONAL ROCKET FLIGHT USA - MEXICO: 1936 (July 2-3), dark brown cover souvenir booklet, containing imperforate triangle single stamps and sheets of four 50c in red and blue (USA-Mexico) and in green and red (Mexico - USA), as well as two covers for direct and return flights, generally fresh and mostly VF, Est. $300-$400 (Image)

1972, Kii Statue and Temple, 11c multi, bottom margin single with blue and green (litho) omitted, full OG, NH, VF, C.v. $425 (Image)

1973, Progress in Electronics, 11c multicolored, left margin single with olive color omitted and only traces of vermilion frame are presented, full OG, NH, VF, C.v. $550 (Image)

1978, Wright Brothers, 31c multicolored, two blocks of four, each one containing two vertical se-tenant pairs, first one with practically omitted offset colors, while other one has all offset colors strongly shifted to the top, full OG, NH, VF (Image)

1978, Wright Brothers, 31c+31c multicolored, transition strip of three vertical se-tenant pairs, left pair has all litho colors omitted, while right and middle ones have tiny traces of these colors, full OG, NH, VF and very rare, according to Scott Errors Cat. only 15 pairs exist, C.v. $1,500 doesn't reflect the rarity of this pair especially in transition multiple (Image)

1985, Aviation Pioneers, Lawrence and Elmer Sperry, 39c multicolored, bottom right corner margin vertical imperforate pair with ZIP imprint, full OG, NH, VF, C.v. $1,250 (Image)

1985, Junipero Serra, 44c multicolored, top right corner margin vertical imperforate pair, full OG, NH, VF and scarce, C.v. $950 (Image)

1991, Harriet Quimby, 50c multicolored, left sheet margin block of four imperforate horizontally, USPS imprint on selvage, tiny wrinkle at the bottom of lower left stamp, full OG, NH, VF, C.v. $1,600 as two pairs (Image)

1998, Space Shuttles, imperforate proofs of $3.20 in magenta and $11.75 in cyan, two vertical se-tenant pairs with horizontal gutter in the middle, printed on coated and uncoated paper, no gum as issued, NH, VF and scarce, C.v. $1,150 for pair on coated paper, the other pair is priced with ''-'', Est. $1,000-$1,500 (Image)

1938, Aerovias Nacionales, 1st issue, 5c, 10c, 15c/10c, 25c, 40c, 75c and $1, complete set of seven semi-official stamps, full original slightly dryish gum, NH, VF, 2,000 complete sets were printed, Sanabria #S1-7 (Image)

1941, Aerovias Nacionales, 2nd issue, 1c-10c, set of four miniature sheets of six triangle stamps, in addition air mail cover from San Juan to NYC franked by 1c-$1, complete set of eight and US 10c blue (No.C7), nice and fresh, sheets with full OG, NH, all are VF, Sanabria #S8-15 (Image)

1925 (April 21-22), Airship (Z.R.3) Los Angeles First Flight three covers from Lakehurst to Bermuda, franked by one or two stamps, tied by Air Mail Service New York Apr.15.1925 or Apr.18.1925 (not listed in the Cat.) or normal Lakehurst Apr.20.1925 date stamp (not listed in the Cat.), each one with Hamilton ''22.APR.1925'' machine arrival marking on reverse, mostly VF, Sieger #20N, var, Est. $300-$400 (Image)