Can Credit Certs be applied for 1st Class upgrade?
We are flying SJC-LIH on Thursday and we were hoping of possibly snagging a $150 first class upgrade. I have about 300 dollars in Credit Certs, i was just wondering if i can apply this for a first class upgrade.
Do these first class upgrades fill up fast? I would not be able to check in till late tomorrow for a 7am flight on Thursday?