Originally Posted by
Stripe
In the past there was a glitch in the codes CO sent to NW so that, if you got upgraded, CO sent NW the class paid and flown as R (the upgrade code back then). You'd then get 100% EQMs. But that was fixed long ago. CO does a pretty good job of preserving the class paid in your record through upgrades and re-routes.
If you're lucky enough to get bumped to FC on CO that is. But indeed this did work (2 years ago). No experience from me lately though. The 50% deal has kept me away like the plague.