Is it worth it?
It depends on what you are looking for.
It's definitely a great way to meet folks from these companies. Some of them will offer an interview date on the spot if you meet mins and seem like a good candidate.
In any case, you get first hand info instead of opinions from the likes of us on this board.
Phoenix in June? My sked shows Altanta in June.
Looks like you are close to getting enough hours for your ATP. Get it before you go to improve your marketability.
Good luck,
Catfish