I believe EK's aircraft utilization rates is one of the highest in the industry. Someone can correct me if I'm wrong on that.
I'm sure flight/fleet operations figures it out, some 777's are configured for more y pax on density heavy routes, some have crew bunks for ultra long haul routes, etc.
An a/c that just came back doing LAX-DXB could be on the ground for a couple hours and then do a night turn such as DXB-DEL-DXB, then be on the ground for a couple hours at DXB and then do DXB-FRA etc.
EK aircraft, bringing in the $$$.