I am wondering if it would be safe to add 727s to my fleet. My DC-9s do not have the range I need to start to cover more of Eastern Asia, most of Europe and a lot of Africa. The 727 would give me that range. I am based in Riyadh with 9 DC-9s and 11 F28s and 2 DC-9s on order. If I added the 727, would I take huge commonality hit?