Task: Question Generation
Input (English): Another residence was maintained at Lake Bled, while the grounds at Karađorđevo were the site of "diplomatic hunts". By 1974 the Yugoslav President had at his disposal 32 official residences, larger and small, the yacht Galeb ("seagull"), a Boeing 727 as the presidential airplane, and the Blue Train. After Tito's death the presidential Boeing 727 was sold to Aviogenex, the Galeb remained docked in Montenegro, while the Blue Train was stored in a Serbian train shed for over two decades. While Tito was the person who held the office of president for by far the longest period, the associated property was not private and much of it continues to be in use by Yugoslav successor states, as public property, or maintained at the disposal of high-ranking officials.
Output (English): What company bought the presidential Boeing 727 after Tito's death?