I recently travelled on AC from Toronto to London with a Samsung Smart Tag in my luggage for the first time . Due to a last minute, aircraft switch, my bag was left behind and I knew it when we took-off as I could see the bag still at the terminal updated by a nearby galaxy phone after we left the gate.
I could monitor the progress of the bag for the next 3 days with frequent updates from nearby galaxy devices.
First day (Day after my Arrival in London) : Bag arrived in London on the first AC flight at 0630 and spent the rest of the day in the terminal area
Second day: Was moved overnight to a warehouse north of the airport for the rest of the day
Third day: Left the airport on a delivery vehicle at 1030 for a 6 hour drive through Oxford, Aylesbury, Milton Keynes and Watford, finally getting to me near Elstree being the final delivery for the day.
Buying the "Smart" tag was a "Smart" move and worth the cost.