Originally Posted by Traveloguy
I always thought the colour of the sticker dictated whether you were allowed treatments within the MB Spa. This makes it easy for MB staff to identify entitlement considering their very unlikely to have an knowledge of the other codes that exist on the boarding passes.
Although T4 has no coloured stickers and the MB Spa folks have to work out who is entitled from a shorthaul and longhaul mix. They probably just have a crib sheet.
Talking of MB Spa treatments I realised the other day that if you are upgraded to J/F from a lower class you can still get an MB Spa even if you can't get in the lounges. Lounges swipe boarding passes but the MB Spa just check the boarding pass for destination and booking code.