Was on the FRA-SFO yesterday which was delayed about three and half hours due to a mechanical out of the originating airport (SFO or ORD). Not a big deal since I was transferring enroute from IST, just took a longer nap and had more potato salad and Franziskaner while waiting in the LFT lounge. Wasn't expecting anything but even before I landed, there was an appreciation email in my inbox. 10K miles, $250 or 10% offer. Went for the $250 since I have piles of miles...