Originally Posted by
Diederick
Upgrade clearance 100% always FRA-LAX or FRA-SFO, even on fridays and sundays. I allways call ahead though.
I'm going to try upgrading C->F SFO-MUC and back in June, but I'm curious: whom do you call ahead and what do you ask them? Do you call LH at the airport you'll be upgrading from or central LH number or what?