How do I know the air-speed of my kart?

Question

This question makes reference to the air-speed of the kart, thus implying that there are different stats for air speed and ground speed, however I can't seem to find any indication of this in-game.

How do I know the air-speed of my kart?

Answer 1

The chart JohnoBoy posted is close, but uses the wrong units. Super Mario Wiki's page on MK7 has all the values. Here's the short version for airspeed only:

1. All characters have a base airspeed of 4 (out of 6).
2. If you're using one of these karts, you get a -0.25 penalty:
   • Barrel Train
   • Blue Seven
   • Bolt Buggy
   • Bruiser/Growlster
   • Cact-X
   • Gold Body
   • Tiny Tug
   • Zucchini/Gherkin
3. If you're using one of these karts, you get a +0.5 bonus:
   • Birthday Girl/Royal Ribbon
   • Bumble V
   • Cloud 9
   • Egg 1
   • Pipe Frame
   • Soda Jet
4. If you're using one of these wheels, you get a +1 bonus:
   • Roller
   • Sponge
   • Wood
5. If you're using one of these gliders, you get a -1.5 penalty:
   • Paraglider/Parafoil
   • Swooper/Swoop
6. If you're using one of these gliders, you get a -3 penalty:
   • Flower Glider
   • Peach Parasol

Note that gliders have the strongest influence on airspeed - also note that the gliders with the biggest airspeed penalty have the biggest air handling bonus, so they're not total step-downs.