I thought that G is the fare class I need for an upgrade. I noticed that the second leg of my flight from PIT-EWR tomorrow has room in G. Does this mean that I can cash in an 800 miles NAU ands sit in first if I want. I probably wouldn't want to waste a cert worth 4 e-upgrades though anyways. Too bad I haven't turned in my certs for e-upgrades yet. I'm silver by the way.

G is domestic upgrade from discount fare.