I have given up putting my luggage tag on my checked/hold luggage. I usually find it has snapped in two at the luggage carousel on arrival.

Asiana and many Asian airline colour code their boarding passes. My best experience was at Seoul on when I arrived at the gate with my yellow First BP a few minutes before boarding began. A member of staff at the gate came up to me behind the Y and J crowd, after eyeing my yellow BP, and walked me through the gate after which other pax were allowed boarded. I was escorted all the way to the door of the plane where the CSD took over and escorted me to my seat. Now that a good reason for a premium pax to remain loyal.