I travelled from the hotel lobby directly to the EWR terminal C. The bellhop mentioned some flat rates, and the driver asked me it is $85 flat, ok?

I understand it is flat to JFK, and very possibly the meter should be used to go to EWR. But I needed to reach EWR on time, and didn't care too much about being overcharged for $15. However, I do wanna know the exact rules.

I think it is very possible that I was tricked. But, it is also possible that if you get the cab by talking to the doorman of the hotel and they blow the whistle to get a cab from the hotel waiting lane, there could be special fares, which may contradicts the government rules of no flat rate to EWR.

That's why I want some opinions from you guys~

Yes I think it is a regular NYC yellow cab with signs and everything. The credit card transaction says Manhattan Checker.