Air stunt goes badly wrong as Red Bull pilots try to SWAP planes 12,000ft up

"It just went and instead of stopping in that 90-degree dive, it just kept going and got over on his back.

"You're just happy everybody's here and good and all that stuff, but just disappointed."

Meanwhile, Aikins said: "This is the best outcome of a bummer situation, really."

Red Bull had promoted the stunt on its website as a statement said: "On Sunday, April 24th, Luke Aikins and Andy Farrington will go down in history as the first pilots to take off in one aircraft and land in another after sending their airplanes into a nosedive and jumping out of them!"

The cause of the crash remains unknown.

It's not known if the duo will repeat the stunt.

The Federal Aviation Administration is investigating the crash.

Officials had previously denied a request from Red Bull that had asked for an exemption to perform the stunt.

Bosses said an exemption "would not be in the public interest and cannot find that the proposed operation would not adversely affect safety".