Is he high? ;-)
The almighty interweb says that the La Paz airport is at 4061 m (13325 ft). There's an airport in Bangda, Tibet, which is at 4334 m (14219 ft). Lhasa, Tibet, has also an airport above 14000 ft.
It must be fun to arrive there on a flight e.g. from Lima, which is at sea level..