CTT Systems AB (publ) engages in the design, manufacture, and sale of humidity control systems for aircraft in Sweden, Denmark, France, the United States, and internationally. It offers humidifiers for passenger cabins, flight decks, crew rest compartments, and VIP/business jets under the Humidifier Onboard name; dehumidifiers; active moisture control systems for humidity control; and anti-condensation systems that reduces airlines' climate and environmental impact. It serves commercial airlines and private jets. The company was incorporated in 1991 and is based in Nyköping, Sweden.