It's like a rocket.... with a man in it! (This actually was an advertisement pitch for the object you see on the picture here)
Mechanically? 1 to multiple use installation which houses a few planes on those launch platforms. Benefits? They are hiding and while definitely can be destroyed from air, must be scouted out first.
Instant takeoff tiny airfield with very limited amount of uses, that you can't land on. Maybe would house nuclear-armed Revokers or something similarly speedy, and be unlocked as the escalation goes on.