NASA has awarded a $4.2 billion contract to Boeing and a $2.6 billion contract to SpaceX. The contracts include certification and development at up to six missions. The missions involve flying astronauts to the International Space Station. SpaceX, the commercial space travel company led by Elon Musk, has already sent supplies to the ISS. Blue Origin, the commercial space venture founded by Amazon.com CEO Jeff Bezos, also joined in the Boeing bid.