“aircraft normally needs a runway of 9,119 ft to get airborne at maximum weight; Jabara’s runway is only 6,102 ft long.
Brad Christopher of the Wichita Airport Authority told the Associated Press news agency the company that operates the aircraft had “assured us they’ve run all the engineering calculation and performance and the aircraft is very safe for a normal departure at its current weight and conditions here”.”
https://www.youtube.com/watch?v=swTjsxM7WW4
The key words are ‘normally’ and ‘current’. When it left I can assure you it didn’t go at max gross.