How Easy are Upgrade Coupons to Use?
Just applied for the AGR MasterCard the other day and the upgrade & companion coupons were added to my account. I have an Acela business class ticket from Providence to Philly booked on a Sunday in September (after Labor Day). I tried to apply the upgrade but was told I could only do so 12 hours before departure. This seems like an attempt to make these upgrades hard to use, as it is dependent on an upgraded seat being available last minute.
Does anyone have experience with using these upgrade coupons, and are they hard to use in practice?