Airframe Driver... I'd be a bit more comfortable with that one if you're talking TAS, rather than generically "airspeed", which most folks will more usually equate to IAS. However, your example is really only close to the right value at 1000 FT (ISA +15) and gets behind the eightball from 3,000 FT on up. Lower ISA deviation values will give a few bonus points, of course.