We badly need more options for LAX to PHL. I think LAX to EWR is feasible via VX as a substitute, but the US LAX to PHL is not very good. Maybe AA will put a 32B plane on this route, but until it does so, this feels like a major city pair that needs some attention and the existing service is not good for a transcontinental length flight.
I agree with others that typically DL would announce something like this especially with AA announcing LAX to ATL. AA did remove LAX to EWR as well, so except for LAX-JFK, there are not a lot of choices for these routes.
Personally, except for LAX-JFK on AA, I have been going via PHX or DFW for EWR or PHL as there is no service advantage for the nonstop on legacy carriers.
Rasheed