Let's assume for a second that TDG is ripping off the USG. Any speculation as to what the USG can do? These parts have no alternative suppliers. So besides ground aircraft in need of miantence, can they force a private company to supply parts?
This is a good question and I'm not sure what the answer is. Obviously there's this call for an investigation, but I think the USG's only recourse is clawbacks of overpayment + some fine for overcharging. Maybe they could cancel some contracts and/or block them from bidding in the future but that would only be on a limited basis and not until alternative parts are available. Best I can tell, TDG doesn't rely on patents as much as they do relationships/LT contracts. Best I can tell, TDG is still entitled to 'reasonable profit' (which seems to vary between 8% and 12% - I'd guess they mean pre-tax margin?).
One of the issues I have with getting negative on TDG compared to VRX is TDG's business is legitimately great. They truly do have the best-of-breed suppliers and deserve a lot of their monopolies. I would buy them at some price. I keep going back and forth on whether TDG faces any real threat to their operations. Even if they were fined and EBITDA contracted, they could always raise more equity to continue to earn above average ROE. Current shareholders would definitely feel the pain but I don't see $0 as a realistic outcome. This is definitely in the too hard pile for me, but it's interesting to look at.
Cause it worked so well for Ackman wrt HLF. 
Too soon!