Airborne has only two uses: Anti-Wings and Sky Blitz.
Bringing along a card specifically to counter Wings is, to put it bluntly, stupid. That usage would be even more restricted than the use of Purify, because typically those that bring Wings along also bring one of the Spiders/Recluses.
Sky Blitz doubles the damage of the Angel's Wings-ed creature for one turn. This is hardly useless, but I think I'd rather just bring another copy of the creature instead; it will probably cost more quanta, but you won't lose as much if your opponent takes down your creature (only one card instead of two), you get more uses of the creature's abilities per turn, and your damage is doubled every turn instead of for only one turn.
Long story short- without more uses for Airborne, spells that do nothing but grant Airborne are useless. That said, this might be useful if you want to make it a creature or (preferably) permanent that could grant Airborne reusably.
Also, see Plate Armor for why HP-only boosts are not generally useful.
