I think that this might make the CZAR and Atlantis overpowered (Though I'd be all for it ). Think of keeping the atlantis in the fleet while it is in battle. If you see that you're going to lose, you can let it keep building torpedo bombers while the whole fleet retreats. The ability to turn the balance of the battle around is increased immensely that way.
Somewhat the same goes for the CZAR, only with restorers or ASFs. I the player wants to build such a unit early on, it will lack air support. If you can build that air support on the way towards the enemy, you'll be able to attack with such a powerful unit way faster.