TUI have been operating a lot of freight charters with pretty much their whole 787 fleet, more than one on some days, mainly with the -9 fleet.
Routes operated include;
Frankfurt-Greenville
Frankfurt-Mexico City
Frankfurt-Seoul
Stuttgart-Guardalajara
Stuttgart-Mexico City
Stuttgart-Detroit
At the time of writing G-TUIJ is in Stuttgart, G-TUIN in Guardalajara, and G-TUIO is in Mexico City.