If memory serves me, I think it was year 2013 when I read pool cues were removed from "black list" by TSA. Not so sure about baseball bats though, but do we pool players care? :grin:
There was a proposal a few years back (maybe 2013?) to relax the restrictions but the proposal was overruled somehow. The story I heard was that airline personnel said they didn't want those items in the cabin.
Edit: Here is part of the first announcement from the TSA from the New York Times:
March 5, 2013
The Transportation Security Administration said on Tuesday that it would allow airplane passengers to bring pocketknives, golf clubs and other sports items aboard in carry-on bags, loosening some of the restrictions created after the Sept. 11 terror attacks.
The agency said the new rules, which align with international standards, would allow its security agents to “better focus their efforts on finding higher-threat items such as explosives.” Box cutters and razor blades are still prohibited in carry-on bags.
...
The changes, however, attracted sharp criticism from flight attendant unions. The Flight Attendants Union Coalition, which represents five labor groups and 90,000 people, said the decision was “poor and shortsighted.” ...
Evidently the flight attendants prevailed. I have donated one pocket knife to the TSA.