Check your April flights. Just found two schedule changes. Both were totally screwy (almost five hour connection in ORD), with much better options. Thankfully I was able to get moved into those better flights but would be nice if UA would have done so in the first place. As Global Services, a little frustrating they'd re-route me to arrive over three hours late (and after midnight), with a 5 hour connection at ORD.
So important to stay on top of all your rez and your seat assignments.