Originally Posted by COpltASgldPHX

Not "in theory" but in practice the most restrictive applies to the entire ticket regardless of which segment(s) is/are booked in a restricted fare and which segment(s) is/are being changed. The only way around this is to buy-up to an unrestricted fare for the whole itinerary. The ticket still remains non-refundable but the change fees are waived for all further changes with the unrestricted fare. There is only one endorsment line for the entire ticet and if the rules of the fare for even one segment is restricted that endorsement will read: /NONREF/0VALUAFTDPT/CHGFEE