Kathmandu is really the gateway to Everest, with flights operating to Lukla (2880m), the starting point for the 62km, 8-9 day walk to Base Camp (5360m). When
my brother did Base Camp in the climbing season, he said is was very busy at Kathmandu, Lukla, and many of the overnight stops on the way to base camp. Apart
from the serious climbers, there are many "tourists" who make their way to Base Camp, providing a source of income for the Sherpas and general population.
It can be a very hostile environment, and recovering anything can be impossible at times.
Helicopter wrecks along the track to Base Camp
Aircraft wrecks along the track to Base Camp
Twin Otters fly from Kathmando to Lukla
The parking area at Lukla airport, and the steep runway
Sherpas do all the heavy carrying, and tourists are a major source of income
