[geoffeg]

Airframes have a limited lifetime, partially defined by takeoffs and landings (and pressurization cycles). Cargo planes experience fewer cycles than passenger airlines since cargo carriers' aircraft usually only make a one or two flights a day, whereas passenger aircraft a flown back to back as frequently as possible. Historically, cargo carriers would buy used aircraft and convert them, but that's changing.

[pacoWebConsult]

This particular aircraft was acquired by UPS in 2006 and converted for cargo missions. It was originally delivered as a passenger aircraft to Thai Airways International in 1991. [1] I actually saw this exact aircraft at RDU International in August of this year and took a photo, since tri-engine aircraft in general are not very common these days.

[1]: https://www.flightradar24.com/blog/flight-tracking-news/majo...

[fransje26]

The gist is correct, but the subtleties are hiding in the details.

Wide-body (long-haul) airplanes are generally limited by flying hours since they rarely reach their maximum allowed flight cycles.

In contrast, wide-body cargo planes typically fly shorter legs compared to when they are used as passenger carriers. And as a result, they are much more likely to hit their critical cycle limit.

[ferguess_k]

Thanks for the explanation. I'll see if I can find some data on cargo planes.