Brinkley's Ex Flies Kids against Christie's Wishes

Supermodel Christie Brinkley reportedly begged her ex Peter Cook not to take their kids on a single-engine airplane flight this weekend -- but her former hubby reportedly went behind her back and flew them anyway.

Cook was taking the kids out of town while his revealing "20/20" interview aired he and Brinkley's dirty laundry -- and before they boarded the aircraft, Brinkley reportedly received a hysterical phone call from the couples' 10-year-old daughter, Sailor.

"She was crying, saying she was scared to get on the plane," a Brinkley source tells the NY Daily News. The catwalk queen -- and survivor of a 1994 helicopter crash -- then became upset. "Because of what she went through, Christie has always insisted that the family has to travel on a double engine plane with two pilots," the source revealed.

Christie -- who ended things with Peter after he cheated with his teenaged assistant -- then allegedly called the cops, to try to stop the plane in NY. According to the model's pal, Brinkley offered to pony up the cash for a larger flight, but none were available.

A source close to Cook replays the situation differently -- telling People magazine that Brinkley was "trying to interfere with his time with the children, as usual."