Tibet's airport accommodates large planes overnight

Konggar Airport in Tibet, one of the highest-altitude airports, was able to accommodate a Tibet Airlines wide-body Airbus 330 aircraft overnight for the first time, the airline announced today.
The 3,600-meter-high airport in Lhasa was able to accommodate the plane after the airline's technicians solved the problem of re-starting the aircraft's engine in a low air pressure environment after an overnight stay.
A new oxygen diffusion device has been designed to increase air supply during the engine ignition process, the airline said.
High-altitude airports (over 2,438 meters above sea levels) pose safety issues for pilots as low air pressure affects flight performance.

All five airports in Tibet are classified as such.
Tibet has six airports.