JTD is very much alive and often operates on behalf of SAS. JTG is the predecessor that went bankrupt during Covid and the restructured airline is what exists today. A similar situation to how Alitalia went bankrupt and was followed by ITA Airways. Different company even if it isn’t really.
Gonna do a bit of cleaning up in this comment, there were 2 Jettime’s which are essentially the same, using the same logo, but they are different enough with separate ICAO’s and that due to the first airline, Jet Time’s bankruptcy in July 2020.
Jet Time was founded in 2006 and as per above went bankrupt in July 2020,