NASA astronauts Bob Behnken and Doug Hurley may spend more time on the International Space Station than originally planned when they ride SpaceX’s new human-rated Dragon spacecraft into orbit on its first crewed test flight, a space agency official said Friday.

A Russian Soyuz spacecraft originally slated to bring home two Russian cosmonauts and a NASA astronaut parachuted to a landing in Kazakhstan Tuesday, returning to Earth without a crew due to concerns about overheating following a coolant leak while docked at the International Space Station last year.

A Russian Progress supply ship packed with several tons of crew provisions and fuel lifted off Wednesday from the Baikonur Cosmodrome in Kazakhstan on a two-day trip to the International Space Station.