Not unless they decide to form a consortium to organize/cooperate with each other, perhaps motivated by a desire to reduce their liability. What would prevent

Not unless they decide to form a consortium to organize/cooperate with each other, perhaps motivated by a desire to reduce their liability. What would prevent the nominally independent security teams at LAX, ORD, LGA, etc from freely sharing their "intel" with one another? I really doubt you could sell the public on legislation that banned LAX security from talking to ORD security. An airport security consortium of nominally independent security departments may end up being little better than the TSA. (I'd speculate that it could even be worse, but that seems dangerously close to defending the TSA and that makes me feel ill.)