Sorry if I seem to be incorrect from other posters, but I was speaking from experience of flying LAX-STL (with a stop at DFW)...same flight number, but was charged two coupons and got 60 points per sector last year on an AONE3 issued by CX and reissued in LON by BA, both of whom said even though it was "same plane" and "same flt number", I had to use two sectors. Maybe it was just bad luck!?!