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Originally Posted by Passmethesickbag
I daresay that's because travelling ATH-IST via the available OW gateways (LHR, DOH, and AMM) would be neither a legal nor indeed a sensible connection. You'll either need to use *A miles, if you have any, or spend €108 on a return ticket.
The connections might not be sensible, but they would be perfectly legal, as long as the MCT were satisfied. (BAEC now charges for each flight flown, so you can connect wherever you please).
ATH-AMM-IST should cost 15,000 Avios per person one way in Economy. Plus BAEC's surcharges, of course, which might make buying a cash ticket on another carrier the wiser option.