Originally Posted by eightblack

It's rare that I am able to ever find an error in Ung1's comments - but I did want to clarify one thing from the above example

DXB-SIN-DXB is 7,000 miles ROUND TRIP (not one-way). And yes, EK is being a bit cheeky as the actual flight distance is 3633 miles one-way.

SIN-MEL-SIN is 7500 miles ROUND TRIP (or 3744 miles one-way) - so they are being quite fair here.

The logical explanation re why it takes more miles to upgrade the SIN-DXB sector over the SIN-MEL sector is probably all down to premium load traffic and seat availability.

The 3 flights per day between SIN-DXB are already at capacity, whereas the one daily SIN-MEL is always relatively light in J. That's just my personal opinion.