Aeronautical radio communication
After the Second World War, was moved from the shortwave band to the VHF band. Nowadays, it is the only radio service that uses amplitude modulation in this band.
For radiotelephony, the frequency range 118 - 137 MHz is used, originally in 50 kHz (360 possible channels), then in 25 kHz (720 channels) and today in 8.33 kHz channel spacing (2160 channels), so that the number of available frequencies could be multiplied.
The 108 - 118 MHz range is used by radio beacons, the VOR (VHF Omnidirectional Radio Range) beacons; the glide path transmitters for instrument-controlled landing approaches operate in the UHF range of 328 - 335 MHz.
Military aeronautical radio in Switzerland has been operating in the 225 - 400 MHz range since the 1960s; in Eastern Europe, use of the 210 - 380 MHz band was common.
Only on the transatlantic routes shortwave communications is still used because of the distances are beyond the line-of-sight range, which can be used in the VHF / UHF range.