What if this is animated by an Enchantress?
An animated Wall of Air can't move (unless it gains power), since it has a Wall of Air in its middle! If it gains power (or teleports) and manages to move, the Wall of Air applies between the two squares it occupies.
Does this affect the corners of the border? (e.g. Airborne units moving diagonally)
No. 'Border' means adjacent squares, not including diagonals.
How many squares does this aura occupy?
2
Market
$0.05
Low
$0.01
Median
$0.15