Ed Yost own interests turned toward reviving the lost practice of manned hot-air ballooning. This technology had first been invented in France by in the late 18th century by pioneers led by the Montgolfier brothers, but under the Montgolfier system, the balloon's air was heated by a ground fire prior to the balloon being released. The inherent danger of this type of balloon flight led to the system being abandoned when hydrogen and later helium became available. One of Yost's key engineering insights was that a hot-air balloon could be made to carry its own fuel. The invention of relatively light burners
2012 Ljubljana Marshes hot air balloon crash Civil Aviation Agency reported on 27 August 2012 that commercial hot air balloon flights were banned temporarily. The duration of the ban was not given, but the balloon crash was cited as the reason for the ban. Throughout the next year, all involved parties coordinated proposals for stricter rules, which were accepted, and new licenses were granted again starting in August 2013. In the meantime, several operators closed because they were prevented from selling flights, while the remaining ones faced severely reduced sales even after the ban was lifted. In their report, official accident investigators accused the pilot of using