I find the delays they provide are inaccurate often because they improvise around problems, sometimes creating new ones in the process. Recently I had a flight delayed because they gave our plane to another flight that had a mechanical problem. They assigned us another plane and were going to use the original plane to handles that second flight after it was repaired. In theory it would have spread the delays around. In fact it took longer that anticipated to repair the mechanical and they reassigned it us us. We were late about 2 hours I got a $100 LUV voucher I'm pretty sure they picked on my flight because it was only half booked and even less booked after they rerouted a bunch of passengers who were connecting at our destination.