Originally Posted by
10000Ants
Just out of curiosity, does that mean QR assumed SIN and BKK are within 500 miles of each other?
No, not the same time or same ticket, but these are all ok:
BKK <> HKT is ok, same country
HKT <> KUL is <500 miles
KUL <> SIN is <500 miles
FWIW, they calculate the distance between the two destination points, not e.g. (DOH-XXX) - (DOH-YYY)