Originally Posted by JohnAx

Do any of the changes include words like "applicable to tickets purchased after xx/xx/xx"?

I don't think I've ever taken advantage of grandfathering but was under the impression that the rules in effect the day the ticket was sold remain in effect until it is used, the exceptions being that carriers that leave OW can no longer be used (despite being named in the valid-on line) while new members also can not be used.