Originally Posted by
Concerto
I think it's the date that the ticket was issued which counts. You can make changes for 1 year from that date
You're correct, this is from GTC of M&M program:
"2.2 Advance booking period and ticket validity
Your flight awards can be booked up to 361 days before the departure date required. Flight awards are valid up to twelve months from the date of issue."
Thanks for your help