...Errr..sorry for butting in...I was just going to say what a great airplane the L1011 is, and has always been.
It's an airplane that was way ahead of its time.
My understanding of the main reason most larger airlines, at least, change their airplanes for later models is not because of higher maintenance costs, or even slightly higher running costs, but its because the airline wants the travelling public to see they're in a shiney new airframe, and the public like that to...not knowing anything else but what they can see, new seats and carpets.
This is not an issue here, and so they can go ahead and use good, reliable (generally) established types, that still have plenty of good hours, and an FE!
(can't overlook that!).
Cheers...FD...