Vittori, a Europeanspace Agencyastronaut, had spenteightdaysonthe internationalspace station, while SharipovandChiao had been on the orbiting labsinceOctober.
Kelly's crewmates on Endeavour's final mission are pilot Greg Johnson and mission specialists Mike Fincke, Drew Feustel, Greg Chamitoff and Roberto Vittori of the European Space Agency.
This is the first shuttle flight for Fincke and Vittori, although they are both very experienced astronauts having flown a number of Soyuz missions to the ISS. Indeed, on his return, Finke's cumulative time spent in orbit will be 381 days - a record for an American.