The justice dept can do anything they want. Sure.

What they should be doing is hamstringing the foreign carriers operating within the boundaries of the US, not the domestic carriers. IMO, justice in this case is not being fairly applied evenly among domestic carriers.

Now, back to the original topic, what was the goal of "deregulation?" IMO, those goals have been met. Further, if the economic environment, through the razor of competition, has determined that 3 major carriers are the correct mix, all the justice department does is shuffle a few dominoes on the table to cheat the correct order of things. Equilibrium will prevail no matter what they (DOJ) do despite the oligopolistic nature of the airline biz.

BTW, aren't domestic and int'l code shares by definition collusion among competitors?