Watch: Daredevil pair leap off mountain and land inside moving plane wearing only wingsuits

With only wingsuits to glide, two daredevils performed an incredible stunt as they leapt off Switzerland's Jungfrau mountain and into the cabin of a moving plane.

Frenchmen Fred Fugen and Vince Reffet plummeted from 13,000 ft before speeding through the air at 85 mph somehow managing to glide into the custom build aircraft below.

The thrill-seekers were celebrating the 20th anniversary of fellow daredevil Patrick de Gayardon's achievement which saw him jump from one aircraft to another in a wingsuit.

Fugen and Reffet both wore head cams to capture the heart-stopping stunt on video while they maintained contact with the pilot using a push-talk system.

Safely back on the ground, amongst the Swiss Alps, the pair said it was the most intense project of their careers.

"You need to have skills, focus and there's also a lot of work," they told the Daily Mail.

'We had to make the plane safe so we don't hurt ourselves if we touch it. We also worked on the parachutes so they don't open too fast in case we touch the plane."

"The biggest risk was when we base jumped from the cliff. That's why we wanted to train so much before going to the mountain. In total, we flew into the plane 20 times," they said.