For skiers it is the pinnacle of the sport. You and a professional guide go up in a helicopter that leaves you both on the summit of the Ferrez Peak, for example, or on Vértice del Anayet, and you ski downhill anything from 1,200 to 1,600 metres. It is an achievable challenge these days.
It goes without saying that the required technical knowledge in skiing and avalanches, etc. is essential.