As part of their project A Door in the Sky, which

As part of their project A Door in the Sky, which they had spent several months training for by completing more than 100 test flights in Empuriabrava in Spain, the duo B.A.S.E jumped from the top of the Jungfrau, one of Europe’s highest mountains, and flew into a Pilatus Porter light aircraft in mid-air. Now that's a different way to catch a flight.