Zinsen Fen did a great thing by slaying Th'uuban, the cannibal dragon. There was no question in the goodness of his act. However, it was something of a burden on the populace of the neighboring city to handle several million tons of dragon carcass. It blighted the land, its fumes retarding the crops, its dead grimace scaring off tourists, and its bulk blocking so much of the horizon that dawn came an hour and a half later in the morning.
With the swift thinking that ensures promotions, the mayor's aid put the body up for auction before the neighboring castles could figure out what a terrible thing on which they were bidding. This "deluxe luxury item" and "one of a kind memorabilia from Zinsen Fen's greatest adventure" sold for enough coin to keep the township prosperous for decades to come (though the misappropriation of those funds by the newly appointed senior mayor’s aid is another tale entirely).
The L'Argent Family who ultimately bought the dragon's corpse had so little use for it after the party for its unveiling at their new and wholly unnecessary art gallery (formerly a hollow mountain no one else was using that century) that they left it in the hands of the very gypsies that had shipped and handled it for them. Not that the gypsies had much of a better idea of how to use several million tons of dragon corpse than the crazy rich people who had bought it. They tried selling its scales for armor and good luck charms, but both of those opportunities dried up once everyone in the region owned at least ten dragon scales, and felt no safer or luckier than before (though they all felt a bit poorer, a bit cheated, and a bit angry that they hadn't asked for receipts).
The gypsy king had a stroke of genius to make a ship from the carcass. He'd always wanted a ship, in the hopes that his people could sail to new countries that needed shipping, handling and the purchase of faulty good luck charms. Dragons are naturally hollowed out upon death by the expulsion of their own fire, so Th'uuban's torso made a fine hull, and his wings made for an exceptional pair of sails - a truly great pair, since the H.M.S. Th'uuban set off on its maiden voyage to pick up the gypsy king's wife and immediately left the water and took to the air. They had the first flying ship, wholly on accident.
The gypsy king (who was deposed a week later in the wake of the tribe going global, and was replaced with a kinder, more sensible democratic body headed by his wife) took the ship across the continent, barging through crowds of clouds. The town that had auctioned Th'uuban's body shook its collective fist at the sky, and began doubting the value of paving their streets with gold the way they had. The L'Argent Family quickly summoned their lawyers, to see if they could sue for a piece of the profits. Everyone expected the gypsies to make a great profit off of this, and they did.
And that is the story of the first Overnight Air Delivery in the land.