These codes correspond to the agent that checked you in.

It will show == if you checked in using Self-Service and 00 if you checked-in on the internet.

If you chose to check-in with a human-being, a unique two letter/digit code is printed on your BP which corresponds to the person who checked you in.

This can be useful for all sorts of reasons.

For example, if you are accosted at the gate trying to board with your 'reasonable' hand-luggage (trolley-bag, suiter, laptop, widescreen TV, double buggy and, God forbid, a child destined to sit in F (in shorts!) ) and try using excuses such as "it's breakable - the girl at check-in said it was ok to carry it on". The poor agent will be traced down and reprimanded (always in public, always in front of colleagues) for having not made you check in the 35 kilos of hand luggage that you are intending on filling four overhead lockers with!

Similar situations would be when a passenger lands at their destination without the appropriate visa. If this is the case, the airline is fined $2000. Needless to say, those initials on the BP are traced back faster than you can say illegal immigrant and the poor check-in agent is once again bolloxed in a particularly humiliating way.

Fortunately the $2000 isn't deducted from their pay as that equates to about two month's wages on the new pay scales for ground staff!