I was wondering the same thing myself. Drove by the Everett flight line today and there is currently a 747-8F in UPS colors there being prepared for delivery.
1 every 2 months? One would think that the profit point is not worth the real estate that the aircraft takes to build.
Orders are coming in for the 777F...why keep the 748F going other than pride?
Some of the boutique airlines are looking to buy up the A388 the airlines are returning...