Oneworld Award - Measuring Milage
 

How is milage calculated when you redeem a Oneworld Award? I've read that, even if you make a connection, the distance is calculated as if it were a direct flight. But what happens if no direct flight exists?

Here's my example:
DFW -> AMS (Stopover)
AMS -> BRU (Open Jaw)
CDG -> DFW

According to the Great Circle Mapper, that's 9966 miles, but no direct flights exists for DFW-AMS and AMS-BRU. Will this qualify for the 10k mile award?

My great circle mapper shows it as 10,122 miles for dfw-ams-bru-cdg-dfw
(perhaps you omitted the open jaw mileage?). Pretty sure that open jaw is counted the same as a stopover. You'd have to omit CDG and return from BRU to stay under 10K miles.

Depends on the program. AA calculates from origin to destination, most of the others calculate with connections.

I'm planning to take the train from BRU to CDG. Will they still count that mileage against me?

My experience with OW award tickets issued by AA are that open jaws do not count. My last example was East Coast USA - LHR - CAI - open jaw - LHR - East Coast USA for a 10K mile OW award. But why fly AMS-BRU (and is there a NS OW flight)? There is an hourly train between the two, maybe even a high speed one by now.