Originally Posted by
dsquared37
How does one go about determining if a routing is valid? If I wanted to fly BKK-HKG-SIN-DEL (and return) to maximize an F routing would that be valid? Would it still cost the same 80k miles as if I were to fly SIN-DEL?
The surest way to find out is to ask an agent. But my understanding is that you have to both stay within the maximum permitted mileage (MPM, usually 1.2 * the non-stop distance) AND it has to be a published routing. To get a read on the latter, you can see what flights come up in a search on staralliance.com.