Astronauts Robert Behnken and Douglas Hurley successfully disembarked the SpaceX Crew Dragon space capsule and entered the International Space Station.
Between then and the latest mission, the USA astronauts were flown to the International Space Station through the Soyuz Capsule in Russian Federation.
The last time a USA -built spaceship carried crew to the space station was in July 2011, during the final space shuttle mission. Crew Dragon is created to fly and dock entirely on its own, but part of this mission is ensuring that the manual controls work as designed in case astronauts ever need to make use of them in an emergency.
"The trampoline is working", quipped the 48-year-old USA entrepreneur at a post-flight news conference alongside NASA administrator Jim Bridenstine.
Russia's space sector is marred by corruption, with several scandals over the construction of the new Vostochny launchpad in the Far East.
Astronauts were last launched into space from the U.S.in 2011, when the National Aeronautics and Space Administration, NASA, retired its space shuttle fleet, forcing the U.S.to rely on partnerships with Russia's space agency to carry US astronauts to the orbiting International Space Station.
After docking, Behnken and Hurley will be stationed on the ISS for a undetermined amount of time, depending on "readiness of the next commercial crew launch", NASA said.
NASA's SpaceX Demo-2 mission to the International Space Station is a critical final flight test of the SpaceX crew transportation system. For nine years, that flag has been waiting to be picked up by the next crew to arrive on a USA spaceship.
The Falcon 9 rocket lifted off from NASA's Kennedy Space Center carrying SpaceX's Crew Dragon capsule into orbit on May 30.
The countdown proceeded smoothly throughout the day, with the SpaceX Falcon 9 rocket and Crew Dragon spacecraft in good health and the astronauts ready to fly.
The three space station residents trained cameras on the incoming capsule for flight controllers at SpaceX headquarters in Hawthorne, Calif., as well as NASA's Johnson Space Center in Houston.
Hurley and Behnken will be working alongside Cassidy and Russian cosmonauts Anatoly Ivanishin and Ivan Vagner in the weeks ahead, but NASA hasn't yet decided how long the Dragon riders will stay.
Yet that prospect seems unlikely, she added, given that "the US Congress refuses any space cooperation with China". "Think of that", Trump said.
"The crew of Expedition 63 is honoured to welcome the Dragon and the Commercial Crew Programme".
"And in order to create the market where these kinds of programs can be capitalised with public-private partnerships, we need to prove that there is an economy for human activity in low Earth orbit". Tremor was going to join Earthy, a plush globe delivered on last year's test flight of a crew-less crew Dragon. Both companies' crewed flights will be the first times in history NASA has sent astronauts to space on systems owned, built, tested and operated by private companies.