Aviation expert Ron Bartsch told the Today show that Nepal landings are difficult due to the high elevation of the country at the foot of the Himalayas, with the thinner air producing a risk of engines stalling if speed was not maintained.

Source: https://www.dailymail.co.uk/news/article-11638825/Nepal-plane-crash-Grave-fears-Australian-Myron-Love-Yeti-Airlines-flight-crash-Pokhara.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Bartsch said the area was already very "tough" to fly in due to its difficult terrain and high altitude.

Source: https://www.9news.com.au/world/nepal-plane-crash-yeti-airlines-72-on-board-kathmandu-to-pokhara/5f52b150-459c-4396-bc55-2ecdd976bd23