L1011F
I believe Tradewinds at GSO used their L1011F for some 13 years operating year round. Dont think they encountered any major maintenance problems!
Their old plane is beating around in Asia now & have not heard of anything not performing.
Gamco, Joramco, BWIA, ATA still offer maintenance on the type.
I think Gamco & Joramco are not expensive either! Like $14 per hour labor!
Parts are plentiful & cheap! Plenty of pilots rated on type around also!
Whereas the DC10 is big upfront acquisition & a maintenance hog!
The L1011 is solid to say the least!
Look after it and it will stay the course!
Crunch the numbers