Originally Posted by
danger
In January or February of this year I successfully changed the first flight on a DONE4. AA insisted it wasn't possible but I insisted they direct me to the relevant section of the technical rule sheet for the oneworld explorer fare. They couldn't.
Strange, since AA showed me the relevant section without hesitation. It is in their rule sheet, in CX's rule sheet and in BA's rule sheet. Guess you lucked out.
Of course if you change the flight within a period where there is no price increase the reissue against current prices does not make any difference.