Originally Posted by AJLondon
Zone was
Is that the really big M that prints on the bp you are refering to. If so, that is just to tell the whole-world from a mile away (including the glaring lounge matron) from a mile away that you are a lowly economy pax

And a similar big C prints on the same yellow business class bp's.

Just giving you one short supplement of your post. Lufthansa is (on my knowledge) the only airline using the letter M for the Economy class. It's a relict of the last century (sounds nice, doesn't it?) when nearly all of the fares were IATA controlled.
Then with the new Flieg & Spar (Fly&Save) and Wochenend (weekend) fares there was a possibility to save money against the old full fares. As Lufthansa had a very bad and arrogant attitude
against that passengers sitting in the old two class times (First and Coach) they created that arrogant and unfriendly abbreviation in German
M = MINDERZAHLER (a person paying less than the full fare) to tell everyone that these are not good and full paying passengers but passengers which are not worth the full service they get in the coach class which was a mixture of all fares 100%business, 75% weekend, 50% flieg und spar and so on (all sitting in the same class(
So due to that historic calling Lufthansa until nowadays is the only airline using M instead of Y.