I read the rule on Delta website that RUC can be used on Delta One flights within all US 50 states.... but when I do a search for LAX-JFK, all i see is "
Delta OneŽ available with Global Upgrade Certificate" for the flights with upgrade certificate availability. Does this message mean the flight is also available for upgrade using RUC...??? Maybe it's a bug on DL site cuz DL site may still recognize Delta One as international class of service only....