Originally Posted by
NA-Flyer
That's the most silly rule in the airline industry

+1
Flew a couple of weeks ago an UA L fare operated by LX which turned into LX L class.
This would have earned 0 miles with MP.
As I could not check the LX details even with the LX PNR # provided by UA I decided to take the safe route and credited to M&M.
It shows the nonsense of operating carrier booking class.