Ya just knew id be quick to get in on this topic.

In all table top games that use a points system per unit youll have issues where some units are just too expensive for the size game your playing. AI is a challenge since aircraft over 10 hit points come with a hefty price tag, the manta show room stock gear come to 96 pts. its the price of about 5 fighters.
For most of the AI scenarios from the rule books have suggested point values for both attacker and defender around 100 to 200 points. On points alone would have games where 1 manta vs a mob. they may be fun at first but could get old after a few attempts.
We could raise the points for a game, but that runs the risk of havint too many modles to manage.
We could introduce new and exotic weapons that do multi point damage to bring down the airborn behemoths. Each of these weapons could be very costly to keep swarm size down to a reasonable amount and still be a serious threat to a super heavy.
( Eldar Void Specter comes to mind) Tau would likly counter by upgrading thier firecontrol for thier rail cannons to fire on airborn super heavies.
Orks, more blasta bombers and many grot bombs.
Chaos has the harbinger but its not a anti air platform and no matter how I look at that airframe, it will never be anything else than a heavy bomber.
Imperium should bring the storm bird out of retirement.
For multi super heavies on the field at the same time. special rules? like what? I mean what else is necessary beside of the core rules?
Over the fall campaign ill be gathing data on this topic as I have 5 mantas available to test out theory.
It will be entertaining to figure out what tweeks will be needed.