Summer of 2012 I took a last-minute Friday night trip MDW-ATL-TLH. As was the norm, that late Friday night MDW-ATL flight was delayed, to the point where I would misconnect on the last flight into TLH. I was rebooked on US out of ORD and was reimbursed for the cab fare. All of this was done via the PM line and I was on a 25k award ticket to save about $1100.
YMMV.