Join Date: Sep 2007
Location: HKG/YVR/NYC
Programs: AC 75K, A3*G, AS MVPG, AA LT Gold 1MM, JL/JGC (OWS) , Marriott Titanium, Hertz 5*, Avis PC
Posts: 3,703
An instant upgrade fare(YUP or KUP) post as first/business class, the only worry you might have is if you get irrop and you get rebooked in economy, then you might have problems.
I class will post as business and P class will post as first