WN has an absolute defense to an antitrust action claiming that its control of 16 gates is anti-competitive, and that's the WARA where Congress and the President gave WN a pass on those 16 gates.
WN's recent acquisition of two more gates, on the other hand, has not been blessed by lawmakers, but there are rumours that the DOJ has approved the WN lease of the two extra UA (formerly ExpressJet) gates. This is where it might get interesting. Suppose someone brings a lawsuit alleging an antitrust violation for those two new gates - WN doesn't have an ironclad defense that permits it to control 90% of the gates like it does for the original 80% of the gates.