My friend and I cleared LAX-EWR on a mid week red eye about 3 hours before departure. I was surprised really.

However, take PS JFK/LAX. SO much better of a plane. And upgrade is VERY easy for a 1k - the only thing is you have to use your CR1's, which is very much worth it. You will be much better off than the very uncomfy CO F seats. You can also use miles which isn't very much and no copay for elites. Totally worth it on this route.