I've had very good luck using the Reserve card first class companion certificate. It's very easy to use - online and it works. It's flexible - it's transferable for someone else to use (family members). It's a HUGE bargain - I've saved a ton of money using them over the years. I'm still trying to figure out any negative about this credit card perk. I don't see any other than it does limit you to the lower fares, but those are readily available.