So, you "need" this to use grav chutes. Included is the training to also pilot a battlecruiser. Also it's based on agility. I see a few oddities here

A battlecruiser would be operated by Operate (Voidship), actually.

Operate (Aeronautica) is everything from Grav-Chutes to Aquila Landers to Thunderbolt Fighters and Marauder Bombers.

Being able to operate a Grav-chute would be something I'd insist on learning if I was going to Operate Aeronautica but I see where your coming from, I'd probably just skip that particular requirement and drop the -20 penalty.

DW

Oops, forgot about operate voidships there for a minute and about the agility being used, i guess it makes sense since most captains would be using a MIU and would use their quick reactions this way to make certain maneuvers. So let's pretend I didn't make this post.

I'll go hide in shame for a few minutes.