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sion%u2014as a part of the country%u2019s National Air Mail Week. This was a promotion in which Postmaster General James A. Farley encouraged every American to send a letter via Air Mail between May 15 and May 21 of 1938. He was quite encouraging, so many people did.Lafayette%u2019s Postmaster, R.M. Isherwood, collected a total of 2,204 letters for the special occasion from Lafayette, Delphi, and various Tippecanoe County communities. This mail was transported by truck, in a parade from the Post Office, to the Purdue Airport. There, it was placed aboard a Waco-F airplane which left for Indianapolis at 10:15 a.m., piloted by local aviation pioneer Captain Lawrence I. Aretz. A unique cachet was prepared and rubber-stamped onto all the outgoing letters. It featured the Jupiter balloon, as well as a modern (by 1938 standards) airplane. On the 80th anniversary of Jupiter%u2019s flight, the Lafayette Philatelic Society sponsored a celebratory airplane trip, which was more a stunt than a real Air Mail flight. For the occasion, they also printed a special cachet for each cover to be flown on that flight, which featured the Jupiter balloon. Each cost 10 cents, to reimburse the cost of the stamp, envelope, and other incidentals. Besides the special flight, a program was held on the north steps of Lafayette%u2019s Courthouse and broadcast over Purdue%u2019s WBAA radio station. Speakers included Mayor A.R. Killian and representatives from the Chamber of Commerce, the County Historical Society, the Post Office, and the area%u2019s stamp club. One of the highlights involved local resident Michael Teague announcing he had witnessed Jupiter%u2019s ascension 80 years ago.For the second time in two years, Captain Aretz piloted a mail-carrying airplane from the Purdue University Airport%u2014this time with a consignment of 361 letters. But he was not alone when he took off at 11:30 a.m. Two members of the Philatelic Society came along as passengers. When Aretz reached Crawfordsville, he circled the town, then returned to Lafayette. Upon landing, the covers were taken to the Post Office for delivery.About a month later, the Philatelic Society sponsored an exhibit of rare and valuable stamps in Purdue%u2019s Union Building, and a poster stamp was released especially for the occasion. A poster stamp is also known as a Cinderella stamp, and it cannot be used for postage. Instead, it is akin to a sticker or a label, and as such, it%u2019s purpose is simply to celebrate an event or an individual.There were probably discussions about celebrating Jupiter%u2019s 100th anniversary as early as its 80thanniversary. But it wasn%u2019t until 1955 that the ball really got rolling. That%u2019s when Walter Scholl, a Chicago stamp collector and balloonist, suggested the idea of a postage stamp to commemorate the occasion. At that time, the Post Office received around 3,000 proposals for stamps each Poster stamp, Lafayette Philatelic Society, September 1939.