Old Jun 13, 13, 2:13 pm
Join Date: Mar 2012
Programs: US CP ; LH FTL ; *G
Posts: 1,630
You won't be upgraded from X/I/O fare class. This simply will not happen.

Upgradeable fare classes are listed in the M&M T&C.

Also, LH doesn't open upgrade availability until very close to depature, so using other airline miles is problematic since you cannot get on the upgrade waitlist.

Also, you'd need a Y/B/C/D fare class to use other carriers' miles. If you want to upgrade a discount fare, you'll need to use M&M miles.
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