Originally Posted by
cfischer
There is no fee to convert flight numbers and A indeed maps to E, which is upgradable. HUCA ... that should not cost a cent to do. Now, the seat assignment fee will be gone if you upgrade and succeed. You call UA to ask to 'use +Ps to upgrade and you need a conversion to the native LH flight number' ... that should trigger the right pavlovian reflex

And be free.
Is that always true? Aren't there times where the faer bucket availability is different between the codeshasre and the native number? I've seen this on UA/NH flights before. And, if so, if there is no availability in LH E (vs UA A), what happens when you try to convert the flights?