Aerial Modification

The clause doing the real work here is the middle one, the part that has nothing to do with the +2/+2 and flying. Vehicles are a strange object: they have power and toughness printed on them, but they sit inert as artifacts until something crews them. This Aura sidesteps the whole crew tax by making the enchanted Vehicle a creature permanently, regardless of pilots. A vehicle with a fat printed body becomes a flying threat that attacks and blocks under its own power, and stays one even on turns you have no creatures to tap. That is the design idea: an enchantment that converts a conditional combatant into an unconditional one, then pads the stats on top. On an ordinary creature it reads as an overcosted flying-granter, which is why the card has always been a build-around rather than a generic buff. The cost of the Aura's flexibility is the cost of all Auras: you are committing five mana and a card to a permanent that dies along with its host, and the host you most want to target is itself the most fragile point of the line, since enchanting a Vehicle to animate it also leaves it open to creature removal it would otherwise dodge. The card is for decks that want their artifact threats to fly and never sit idle, and it pays for that with the same two-for-one risk every Aura carries.