I know there was discussion at some point about the opening time of the bar in EWR on Sundays probably due to outdated local laws in Newark and/or Elizabeth (I think term A is Elizabeth and B/C in Newark). Have not seen it discussed in a while, but I seem to recall they couldn’t serve before 11 or noon - at least in the past - not sure if it is still the case. Have not heard about this in other jurisdictions (in terms of lounges having to wait until a specific time to serve).
there are other weird laws - they can’t serve alcohol on the ground onboard in Canada unless they procure/pay tax on it there - so I guess AC will but UA won’t (because why cater alcohol at higher prices and double the tax when you can double-cater from US and just not serve for like an extra half-hour.).