Currently due for certification in early 2020, the H145 proved its high-altitude capabilities by landing on the summit of Aconcagua, Argentina, which, at 6,962m (22,840ft), is the highest mountain in the Southern Hemisphere.
This is the first time a twin-engined helicopter has landed at this altitude, says the manufacturer
But was it able to take off again after landing? Getting a bit jaded by 'marketing speak' I guess.
Actually; since I have almost no practical helicopter knowledge other than "duck if the blades are turning" as seen on TV, is it harder to land (safely) at altitude than take off?
I would assume takeoff would be harder but assumptions in almost any field can be a bad idea..