History is surely one thing, but another key point is that these speeds are always KIAS (indicated air speed). This is a measurement that doesn’t correspond to

History is surely one thing, but another key point is that these speeds are always KIAS (indicated air speed). This is a measurement that doesn’t correspond to either true ground speed or true air speed (but is far more useful for flying than either of these). Certainly I would find kph/mph slightly confusing as you might expect it to correspond to some actual velocity, rather than something to do with air pressure. Maybe we should measure airspeed in mbar instead? (ofc navigation is a different matter, and there just history prevails)