It’s all about the hundreds and thousands. There are some minor ICAO changes to radio phraseology that became applicable 8 November 2018.
| Application | Example | Transmitted as | What's changed? |
|---|---|---|---|
| Flight levels | FL 200 | Flight level two hundred | Use hundred instead zero zero |
| Altimeter setting | 1000 | QNH one thousand | Use thousand instead of zeros |
| Transponder codes | 2000 | Squawk two thousand | Use thousand instead of zeros |