> Unlike airplanes ... cargo ships are in nearly constant operation Cargo ships do do much of their maintenance underway, but other than that, I'd say the diff

> Unlike airplanes ... cargo ships are in nearly constant operation Cargo ships do do much of their maintenance underway, but other than that, I'd say the difference is a lot less. (Not that this is a big deal, more pedantic). Cargo ships turn around in ports over a few days, unloading, loading. They may also wait for hours or days for a berth. https://www.flightradar24.com/data/aircraft/n513dz https://www.flightradar24.com/data/aircraft/n513dz - Delta A350. Basically running 24/7 other than 3 hour turnarounds at airports.