The best replacement for airspeed is ground speed.

The best alternatives to airspeed are rated as following:
★★★★★  ground speed
★★  airscape
★★  indicated airspeed
★  lift
★  true airspeed
★  mach number
★  mach
  angle of attack
  indicated
  rate of turn
  hoover windtunnel
  dynamic pressure
  land speed
  drag
  true speed
  indicated air speed
  calibrated airspeed

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airspeed
ground speed
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