According to Official Guinness Records,
Jarret Reid of Anaheim, California, USA managed by travelling from a ramp at a height of 5.48 m. (18 ft), a single scooter back flip, landing with both feet on the scooter at Van Nuys Airport, California for Guinness World Records: Primetime on 21 January 2001.
For a complete list of 2001 records, please visit 2001 Guinness Records in United States.