Well, JFK is JFK. I arrived 15 mins early once for official check-in time with hand luggage only and was refused a boarding pass in F. Please come back in 15, was the message given. They were sitting at the counters drinking coffee. Apart from that, service was all around good and professional including escort to front of TSA line and a very good dining experience in the lounge. In retrospect I perhaps could have downloaded the LH app and checked-in online, but I wanted the escort due to the lines.