Originally Posted by midway

Lufthansa calculates a lifetime customer equity value (CEV) for each M&M member based on past revenue (1/3) and future revenue (2/3). They rank each of the 10 million members based on their CEV, therefore each member has a rank between 1 and 10 million. Afterwards they put the members in 6 customer equity classes based on their customer equity rank.

My theory is:

If you are in a certain class (maybe the 2nd) you get your "+" behind SEN.

In theory, if they have to give out operational upgrades, the members with the the highest customer equity ranks should get it.