If initial results hold up, NASA says the delayed launch of a commercial research mission to the station could come as early as Thursday.

A chartered spaceflight for India, Poland and Hungary's first astronauts in decades has been delayed indefinitely because of leak concerns at the International Space Station.

NASA said Thursday it was postponing a launch of private astronauts to the International Space Station while it works with its Russian counterparts to investigate persistent leaks on the orbiting laboratory.