Originally Posted by Hannibal Lecter

Okay, I just took CDG as an example, forgot that there's Europe Zone 1,2, 3 and those flying from zone 1 pay a measly amount of miles to upgrade.

You should pay 10k for upgrading the CDG-LHR leg in addition to 50k LHR-LAX.
Those flying from Europe 2 and 3 already pay 10k and 20k respectively for upgrading the feeder flight.
So this is a good change
(As long as the cost won't be increased for those flying from Europe 2 and 3 of course)