Rundown of my experiences with delays--
NW SFO-mem-CHA--Four hours in gate area at SFO, destroying last conxn, no explanation ever provided. Got meal and hotel.
US DCA-clt-CHA--Massive thunderstorm at DCA. They agreed to rebook me nonstop to alternate destination BNA, but in fact, nothing got out that night. Got meals, hotel, and phonecard. Also a meal the next day when a smaller (mechanical) delay put me in CLT during lunch when I should already have been home.
DL TPA-atl-CHA--Thunderstorms. The second leg was equally delayed, but since it was a Delta-to-ASA connection, I was not informed, causing me a needless panic (esp. as my grandmother's funeral was the next day).
US LAX-clt-CHA--West Coast ATC out. They had already rebooked me on DL (I was going to object, since this meant ASA, and I do not fly ASA if at all possible, plus a downgrade would have occurred by that happening), but I just made the connection. Suitcase arrived next day, couriered to my office.
US BOS-clt-ATL--Weather. Arrival in CLT was such that the remaining connection would have stranded me at Hartsfield that night. Agreed to reroute to CHA, and got a phonecard.
US PIT-clt-CHA--I think this was mechanical. Delay would have meant rearranging conxn onto a Dash-8, and I had upgraded. Since the upgrade was lost anyway, I was rerouted onto the also-prop PIT-CHA nonstop. Got the coupon back, a phonecard, and original routing credit.