I was thinking of the 2008 financial crises. Rather than nationalize banks there was a bailout. In 911 there was no nationalization of airports or airlines just more money to set up security theatre. I suppose it could be argued that the DHS personnel are a nationalized rent a cop operation but that sems like its something new not something appropriated

Airport security was nationalized after 9/11.

During the 2008 financial crises, the government did not nationalize the banks but it did "nationalize" how some of the banks did fail. Banks that could/would survive, were told to absorb banks that could not/would not survive with money that the government provided and dictated how much it would be paid back. Technically, not nationalization but pretty close.