OK so if I'm searching for an award flight, for example, from MAD-JNB and it routes via LHR because it's on BA metal - do I need to calculate MAD-LHR-JNB even though I only want MAD-JNB?The miles seem to be whatever gcmap.com uses. You will need to add the miles for each flight within your itinerary. The exception may be if you have a single flight number that goes via somewhere else - where you would be given a single boarding pass that covers the end to end journey. For example, last year the first part of my itinerary was MEL-CMB-DEL. MEL-CMB touched down in SYD for a technical stop (they merged flights). The miles were calculated as direct MEL-CMB plus CMB-DEL, even though the actual routing was significantly longer. Similarly, the route only counted as two of my permissible 16 flights even though I had three take-offs and landings.
Good luck with fitting Asia, Europe, South Africa and the US in a 35k routing originating from Australia. Plugging in the most mileage friendly destinations into GC Map shows 32,000 miles - and that is if direct connections between these cities existed, which most of them don't.
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I had been trying to start the award from overseas but my choices seem too far and wide, particularly if nautical miles are void (Great Circle Mapper showed that option but it wasn't default).