Another way to think about it is sitting the aircraft on the ground in a wind FASTER than it needs to fly, say 80kts. Put power on for 80 kts, rotate and the aircraft will then stay over exactly the same spot on the ground but in the air ( actually it won't because of lack of pilot skill and variations in wind, but in theory it would), on the ground the Groundspeed is Zero and the airspeed is 80 kts but you have not got flying because the angle of attack is too low (and hopefully it was tied down!) in the air exactly the same applies, but you have increased the angle of attack to get it flying.
When you talk about airspeed here it does not matter really in a light aircraft at or around sea level if you are talking IAS, TAS or CAS, they are so near to each other the difference is irrelevant.
NOT something I would suggest actually trying in real life!
