Originally Posted by
CTJoyce
Y,B,M international for complementary upgrades, H,K,Q require a SWU (System Wide Upgrade) or a Miles upgrade, however the miles required for upgrade are 2x the normal (so for instance most TATL flights are 25,000 RDMs for a BE upgrade, instead of 12,500 if you had a Y,B,M).
There are no complimentary medallion upgrades on international flights except to Canada, Mexico, the Caribbean, and some destinations in South America.