Atimeter settings (correction)
How long has ATC used the terms "QNH" and "QFE" for altimeter settings, and how long has the UK used millibars for altimeter settings, was those terms used (and millibars) during WWII? I know the USA used inches of mercury and usually does not refer to the Q codes for altimeter settings, just "altimeters", does that mean above field or MSL?
Luke