Overall I was unimpressed by this last week. It showed my bag being checked and loaded onto the plane. Then, upon arrival, the app deleted everything to do with the flight (boarding pass, the info in flight status, and knowledge of my checked bag).
You can retrieve the bag info after arrival by typing in or scanning the bag tag number, but the app never indicated my bag getting off the plane or put on the belt. I lost interest in testing after my bag came out the chute.