Originally Posted by
PVDtoDEL
Yes, I have it in writing from the manager of Miles and Bonus.
However, I'm inclined to think that the revenue from the miles credited to Miles and Bonus pay for the lounge access and more.
If the status airline pays for lounge use, then it could be important to enter lounges with just the boarding pass when flying international J/C for example, so that the operating carrier pays when flying premium classes. OTOH, LH would be a special case as having *Gold gets you into a different and better lounge than the one you can use due to having a business class ticket, so that you would always what to show the *Gold card to enter the SEN lounge.