Landing a plane high in the Himalayas. This is Shyangboche 3748m. See how the plane appeared to have emerged from between the snow-capped peaks and then taking off into the mountains. Little margin for error.
Flights into Shyangboche must be chartered. Not cheap. May be good for groups with a lot of money and very little time. Just fly in, then descend to Namche Bazaar to acclimatise before proceeding to Tengboche if you’re doing the Everest trek.