Is there a sticky on how to search for NF or NC space on CO's site? What does NF or NC correspond to CO's fare class? My accounts are linked. I am looking to use my UA SWU for EWR-HKG during the 2012 Labor Day long weekend. I did a flight search via the "OnePass Reward Upgrade". Does this apply to SWU? The results returned "Fare Class: BusinessFirst (R) with R4 and RN4" for both segments. I hesitate to purchase the ticket since I am not sure if both segments have upgrade availability. Thanks in advance.