that is correct and the lawsuit will be about the law, not economics of the industry, esp. forwarding looking predictions of how a company might do as justification for a merger today. FWAAA is correct that mergers are not predicated on trying to determine some sort of future outcome for the industry, including whether AA or US can ever compete against DL and UA.
There is also no legal basis for arguing that the industry should have 3 network carriers or similar size plus WN. None.
The DOJ's case must be based on consolidation as it would exist today as a result of this merger and most specifically the uncompetitive nature of this merger...
and will due respect the verbal and written evidence the DOJ trotted out regarding expectations of higher fares and attempts to eliminate consumer-friendly competitive actions makes it VERY hard for AA and US to overcome whatever economic argument they might have been able to use. The fact that US' existence for much of its time since BK has been based on undercutting other carriers is key evidence that they have managed to succeed so far (and profitably so) yet walking away from that business strategy thru a merger would be damaging to consumers. IOW, perhaps US should have thought thru the long-term implications of being a bottom feeder in the airline industry and the role they would be locked into by doing so.
I'm not sure people here really grasp how damaging it is for a government official to hear that the merger will result in fewer choices for consumers and higher prices which is EXACTLY what a number of the internal documents AA/US produced and which were uncovered by the DOJ said.
As much as AA and US want to try to shift the argument to economic matters including the "unfairness" of DL, UA, and WN getting a merger but AA/US being denied, there was clear evidence that was presented regarding the uncompetitive effects of the AA/US merger which simply were not presented regarding other mergers.
OTOH the DOJ needs to drop its argument about "we've looked at the industry and decided we don't like what we see after consolidation" because that is problematic. At the same time, there never was any requirement on the DOJ that they had to approve subsequent mergers if they approved the first three. There is absolutely no legal basis for saying that AA/US should be approved because the others did. Having the DOJ say they don't like what they see now is not an acceptable reason; the simple fact that the current merger proposal is deemed to be uncompetitive is sufficient.