The frequency 121.500 MHz is designated as:
Domanda 18, IFR Communications - ATPL - Airline Transport Pilot license
| A frequency for air-to-air communication |
| An international emergency frequency |
| An airline operation frequency |
| A regional UHF frequency |
| A frequency for air-to-air communication |
| An international emergency frequency |
| An airline operation frequency |
| A regional UHF frequency |
