our report from nbc news correspondent tom costello. >> reporter: tonight after a record number of disruptive and dangerous incidents on board commercial airliners, the faa sending 43 more cases to the fbi for criminal review. bringing that total to 80 cents at the start of 2021. including an all-out fistfight. flight attendants assaulted, even restraining violent travelers. >> all males to the front of the aircraft. >> after nearly 6000 reports of unruly behavior last year, so far this year, nearly 400 reports roughly two thirds related to the on board mask mandate. late today that texas attorney general sue the biden administration to overturn the mask mandate in airports and on planes. but for the past year, the faa has come down hard on bad behavior, rolling out a national public information campaign. >> these events need to stop,