Cosmonaut Sergei Volkov of the Russian Federal Space Agency, Andreas Mogensen of the European Space Agency and Aidyn Aimbetov of the Kazakh Space Agency are scheduled to blast off from the Baikonur Cosmodrome in Kazakhstan early Wednesday, Sept. 2, at 12:37 a.m. EDT (0437 GMT/10:37 a.m. Baikonur time).