View source for Airport type

'''Airport type''' refers to the type of traffic the airport serves:
*'''Commercial''' - the airport handles scheduled airline flights.
*'''Military''' - the airport is used only by the military.
*'''Mixed-Use''' - the airport shares facilities (typically runways) between military and public operations.  Additionally, it should be specified whether the airport receives commercial traffic or not, e.g. '''Mixed-Use Commerical''' or '''Mixed-Use Public'''.
*'''Private''' - the airport is privately owned and requires permission from the owner for aircraft operations.
*'''Public''' - the airport is open to the public, but handles only general aviation flights.