If the aircraft is not full, the fuel costs decrease correspondingly. We have also not taken into account cargo capacity on the route.
Load factor information is available from the US Department of Transport is it not? 90%+ to DFW for EK. 80-85% for LAX,IAH,SEA etc. DFW is also served by an A380 by LH. However, I think we have reached the difference in opinion: that the residual profit available to cover other costs is in your view not sufficient - whereas other posters argue that since the cost structure of EK is significantly lower than other mainline carriers, the residual profit is enough to sustain the routes even with lower (Y) yields.
Here is some information regarding connections:
http://centreforaviation.com/analysi...revenue-191919