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...