Tower - Controls aircraft movement on the active runways and in the air within 5 miles of the airport up to 3000 feet. They work aircraft in all airspace not delegated to approach control, and the airspace is divided into sectors. Flight Service positions provide weather and flight plan information to general aviation and military aircraft. They are used to arrange transportation, fuel, etc. and provide wind and runway information at airports without towers. Company frequencies are used by airlines to get load figures, arrange meals, get gate assignments, etc.
Ground stations transmit simultaneously on both.
VHF is used by civil aircraft and some military aircraft. UHF is used primarily by military fighters. Ground transmitters are located at the airport served, unless otherwise noted. Center remote ground transmitter locations are shown in parentheses before the frequencies.