Gezeravcı is Türkiye's very first-ever space traveler and will conduct 13 scientific researches during his 14-day stay on the ISS.
The Ax-3 mission is being led by Michael Lopez-Alegria, representing the US and Spain, while the crew also includes Walter Villadei as pilot, from the Italian Air Force, and Marcus Wandt of Sweden, representing the European Space Agency.
The liftoff was initially planned for Jan. 9 but was postponed twice to Jan. 17 and then to Jan. 18.
The 70-meter (230-foot) Falcon 9 rocket, with a diameter of 3.7 meters and weight of roughly 550 tons, has a payload capacity of 22,000 kilograms (over 24 tons) in low Earth orbit, 8,300 kg in geostationary transfer orbit and 4,000 kg on Mars.