This might seem like a weak card now, but it will improve with time as more airborne creatures with abilities are coded.
I'm at work right now, but these are the ones I can remember off the top of my head:
Elite Wyrm, Maxwell's Demon, Fire Spirit, Forest Spectre, Leaf Dragon, Elite Pegasus. (and gargoyle; I forget if it flies in this game or not)
Also all flying weapons with abilities and any flier with a mutant ability or butterfly effect.
edit: Oh yeah, what happens if you play shard of freedom, make an ability free (say wyrm's dive) and then use web on it? I'm assuming the ability stays free, and I'm using the antimatter/butterfly effect/antimatter situation as precedent.