Originally Posted by AnselmAdorne

I thought the numbers in the "Airline use" section displayed a) the check-in sequence number and b) the code for either the agent or the kiosk who checked you in. For example: my last BP shows 0120 and YOW80210 ... I understood that to mean that I was the 120th person to check-in for that flight and that I used an Ottawa check-in agent whose id is 80210. If you use a kiosk, a K shows up somewhere in that code; if you check in through the web, it says AirCanada.Com