Flying out of LAX on thanksgiving morning 5am?

I’ll be flying out of T1 (Southwest) on Thursday morning. I plan to check in bags so I need to get there earlier. I’ve never departed from LAX that early before, and I’ve not travelled on thanksgiving day before, so I’m not too sure what to expect in terms of crowd and how early I should get there.

I also wanted to take the Flyaway from Union where the last bus is around 11pm I think. Will the check in counters and TSA be open all night or will they all be closed?

Any advice will be appreciated! Thank you all and happy turkey day in advance 🦃