They have never charged me the $75 change fee for a date change despite the need to reissue entire ticket. I have done this many, many times. Only fee is for non-date schedule change. The only curiosity in this was where I changed a HKG-PEK routing from near the beginning of my itinerary to near the end. I'm not sure why this wasn't merely a date change.

Does change to electronic ticket effect tickets issued in BKK involving only AA, CX and BA? If so, is it necessary to actually show up in BKK to pick up the e-ticket?