I will say that in the last year I have had at least four or so cases of delayed bags. Two or three of those were due to me changing flights in oversell situation and once due to late check in as TSA made me check bag (funny part to that is the flight was delayed by two hours but bag still missed the flight). The latest one was last week where I received my small box but not my large bag. They then tried two flights before it got to OKC but skipped the main line outta of C or E and keep trying to send it CO EX. The agent in OKC said that it could have been weight and balance issues. Funny thing is the gate check items made it on the plane but the elite transfered bag didn't. I assume that this could be because the elite bags are the easiest to pull as they are at the front of the compartment.