I'm assuming this was an app issue, but I did BOI-SLC last Thursday for an overnight trip. I didn't check any bags, but I'm sitting onboard waiting for the door to close and my phone chirps and tells me my bags are on board. Weird.

Even weirder, I'm heading back to the airport on Friday night and my phone chirps again to tell me that my bags are at the bag claim. Curious, I clicked on the notification, and the bags (or ghost bags), had gone BOI-SLC-LAX-ATL-BTR (or something close to that).