I was trying to use a reserve card companion certificate yesterday for an "I" class flight and the agent I talked to said it could only be used if "L,U,T,X,V" was also available on the flights (which they weren't). Is that accurate? Regardless, didn't use the certificate and just paid but ugh these things are getting harder and harder to use it seems. I did try a messaging agent who was pretty clueless as expected first, perhaps I should of hung up and called again.