From the book Hollywood Pilot, The Biography of Paul Mantz by Don Dwiggins (1967):

…In another air picture, Toward the Unknown, a Warner Brothers director tried unsuccessfully to fake a shot of a formation of F-94s in flight with the wingtip tank of one ship tangled in the accidentally opened drag chute of another.

“It can’t be done!” he finally told Mantz. “I’ve tried every way to hide the wingtip, but you can see plain as day we’re faking it.”

“Let ol’ Pete fly it,” Mantz saids. “He;’’ get your shot for you!”

Over the director’s objections, Mantz instructed Colonel Everest how he used to loop in formation with Frank Clarke, their wings tied together with rope. Everest shrugged and said, “Let’s go!”

In one circuit of the field at Edwards AFB, with The Smasher tucked in close to the jet formation, Mantz and Everest brought off a spectacular scene against a varied background of sky, clouds, and ground, the two F-94s never moving an inch out of position. Everest, an iron-nerved airman who had rocketed the Bell X-2 to more than 1900 miles an hour to become the fastest man alive, found a case of White Horse Scotch whisky waiting for him at home, courtesy of the Paul Mantz Air Services. He was a pilot destined to go places, as General Frank K. Everest, Jr., commander of Nellis Air Force Base in Nevada...