Originally Posted by
AA_EXP09
Let's say there is a DL elite.
AA has a ticket for $299 rt
DL has a ticket for $349 rt
Both the tickets are to the same destination
This elite buys the $349 ticket for elite benefits and a potential UG to F, rather than saving the $50 and flying on AA (despite a 17% difference in the two prices.)
Therefore, the $50 was derived from our loyalty to DL rather than price (for which there was a cheaper option.)
Using that logic, one could argue DL derived $349 from loyalty, as if it weren't for that loyalty, the ticket would have been booked on AA = $0 for DL.