Ballooning, using gas balloons, was on the Summer Olympic Games programme in 1900. The aeronautical pioneer Henry de La Vaulx set two world records for distance and duration piloting a balloon flight. These ballooning events have generally not been classified as official. All events at the 1900 Games that satisfied all four of these retrospective selection criteria — restricted to amateurs, open to all nations, open to all competitors and without handicapping — are now regarded as Olympic events, except for those in one sport — ballooning.