the reason why eac 747's are looking a little tired is that they are all ex BA's - 200's that they retired after 09/11. The insides were knackered then and i bet eac haven't touched them. Good solid aircraft tho wit plent of life left in them. DXO only had 48000 hours on it when it left BA. BA's oldest 100's flew for over 100,000 hours!