What does the abbreviation `HX` mean?
Domanda 4, Comunicazioni in inglese - PPL(A) - Licenza Pilota Privato (Aerei)
| Sunrise to sunset |
| No specific working hours |
| Sunset to sunrise |
| Continuous day and night service. |
| Sunrise to sunset |
| No specific working hours |
| Sunset to sunrise |
| Continuous day and night service. |
