> and I was amazed that something could possibly fly that long It isn't the same plane flying 30 years later. There are standardised checks done at various in

> and I was amazed that something could possibly fly that long It isn't the same plane flying 30 years later. There are standardised checks done at various intervals, including the D check which takes the entire plane apart. https://en.wikipedia.org/wiki/Aircraft_maintenance_checks https://en.wikipedia.org/wiki/Aircraft_maintenance_checks Those checks will replace damaged and limited life parts. The cabin fittings have to be taken out for the D check anyway, so many airlines will replace them at that point if not sooner (eg carpets wear out a lot quicker).