Join Date: Feb 2004
Location: Pasadena, Ca. USA
Programs: UA 1P, AA Plat, Hertz 5*, Avis First, SPG Plat, Hyatt Gold, Marriott Gold
Posts: 326
As others have stated a Z to NF upgrade is unlikely as the upgrade rules require a C or D fare. These rules makes sense for UA as it protects the integrity of F and when you consider an international Z fare could be ~$4K compared with ~$10K for a C fare. This is not to say I have not been lucky enough to end up in F on a Z fare, its very rare and has only happened on full flights on domestic transcons. I think the number one rule of flying applies, always be polite to the gate agents and keep good upgrade karma in mind, they might need a C seat and be whiling to upgrade someone quickly to get the flight out on time. As others have stated Easy Check-in may offer you a buy up offer. You haven't said what route your flying that will also have a significant impact. If you have to fly in F the best option is to re-fare.