What makes a Carrier a Carrier. Part II.

Hello again,

I'm still trying to figure out in terms of game mechanics what constitutes a
Carrier. The rules state that a Carrier can launch two
fighter squadrons per turn.  Non-Carriers (like Dreadnaughts) can only
launch one fighter squadron per turn.

One person mentioned that a Carrier is any ship whose Fighter
Bay mass exceeds 1/2 of the available system mass.  I also remember
someone saying that a Carrier is a ship whose Fighter Bay mass exceeds
1/2 of the damage boxes.

Any idea which system is "valid" in terms of the ship designs given in Full
Thrust and More Thrust?

Again, thanks for the help...

Pete