Originally Posted by
ijgordon
What do you mean exactly? Every fare between every city pair has its own rules. You can either price an itinerary on CO.com and read the rules, or you can use a pay site like ExpertFlyer.com or KVS to look up fares and read rules.
Also keep in mind that not every city pair will have, for example, an "M" fare.
I understand that but I found it odd that the only overseas flight that the M fare upgrade was applicable for was LAX-HNL. I wanted to read the fare rules for a few random segments and see what i could find. Kinda just being inquisitive. I forgot about expertflyer.
Thanks