| Atmospheric pressure at the location for which it is given, corrected for non-standard temperature. |
| Altimeter setting so that the altimeter, on the apron of the aerodrome for which it is given, reads zero. |
| Altimeter setting so that the altimeter, on the apron of the aerodrome for which it is given, reads the elevation. |
| Atmospheric pressure at the level of the ground overflown by the aircraft. |
EN 