Originally Posted by
Rivet Joint
Plus the old trains and planes you refer to are for specialist purposes and used sporadically. They aren’t used every day on numerous sectors for commuters.
Yes, but the American's B52s are 60 years old plus and still form the main part of Global Strike Command and 60 year old KC135s are in daily use. Without wanting to sound like some sort of train spotter I should mention 50 year old class 313 electric multiple units in daily service on Southern operating numerous daily "sectors" for commuters and therefore I think your 30 year age limit is arbitrary and inaccurate. Remember that modern engineering will probably last longer than current 50 year old engineering and I see Boeing's B737 max aircraft as an example operating well into the 2060s and beyond.