The commenter "seeker" asks the question: "Since when can the TSA cancel flights in airports that they neither own or manage? Last I checked, most of the large Texas airports were owned and managed by cities in which they reside."

Who does own these airports?

I think the TSA is bluffing implying that they can directly cancel flights, but they certainly have the power to deny anyone past security such that there are no passengers to fly.

That sounds like a terribly chaotic situation.