Having its headquarters located in Vilnius, it is a subsidiary of Avia Solutions Group offering VIP charter flights, ACMI services and in-flight management services in Europe, the Middle East, Africa and Asia with its B738 fleet.

[4] During the 2017-2018 Euroleague season, KlasJet transported players of the Lithuanian basketball club Zalgiris Kaunas.

[5][6] In February 2018, the Canadian men's ice hockey team arrived at the Olympics in South Korea and chose the Boeing 737-500 for their transportation.

[9][10][11][12] In March 2020, KlasJet free of charge transported the shipment with dozens of thousands of medical masks and gloves to Lithuania.

In March 2023, the company introduced its Boeing 737-300 for the UK market and has decided to move two aircraft to Dubai World Central (DWC).