Search archives - there are about 863 posts on "longests". There are 3 ways to measure "longest" so it's a debateable subject. (Miles, Time and longest both ways non-stop, year round). UA are now dropping the route in August anyway due to miserable loads/yield. CO will continue their EWR-HKG and CX is reportedly coming on line with JFK-HKG.
Cheers. Al.
Incorrect.
CO does operate the flight as well. However UA is credited with this distinction because their flight is a couple miles longer from JFK than CO's flight is from EWR. UA is discontinuing this flight at the end of the summer. At that time Cathay Pacific will pick up where UA left off and start the route to JFK. Run a search on this topic and read the MANY posts and threads already written that cover this topic......