During the Icelandic volcano travel disruption in 2010, I was booked on MLB-ATL-MSP-CDG-SOF. All flights were a go until I got to MSP and the MSP-CDG flight was cancelled. DL decided to send me back to MLB to wait out the volcano (I actually stayed in ATL but that's another story). Anyway, DL gave me miles for the MSP-ATL flight, which I did not pay for. I didn't want to mention that then since I was afraid of loosing the "gift" miles. I figure it is safe to mention now.

BTW, DL was exceptionally kind to me during the Icelandic volcano event and I did write to them and thank them and specifically mentioned several agents who were extremely helpful.