It used to be that the "Offline" arena default settings were the same as the arena settings for the MA.
If this is still true you can simply check the arena settings from the clip boadr and note the different settings.
i did this quick check for an example.
As you can see, the fighter hanger designated (Ftr Hgr) Has a down time of 15 min. and a hardness of 2.7812
Which means it takes more that 2K of ord but not 3K to take out the FH.
Little foot note here. 1x5" Harvest Rocket almost has to be about the equivilent to about 130 lbs of Ord.
This is why a P51D with 2x1000 and 6 5" Rockets can consistanly take out a FH. I have done it hundreds of times.
I have had several players say that it takes 2 x 1000 lbs to kill a FH. It isnt technicaly true as far as the actuall settings go.