Here is my question, booked via Delta SkyMiles first class award SEA-HNL tomorrow at 655PM. Can i 6 hours before on a Delta 006 ticket pay the $25 (assuming availability in first class) for the 940AM flight tomorrow or does this not work. I know I can use the Delta SDC as well to change to a Delta flight, but the only Delta flight with availability tomorrow is the 6PM flight which only saves me around an hour.
And after reading the link above, it appears the $25 fee may be waived for A class tickets, which is what I appear to be booked on.