The new Thuraya 4 geostationary satellite will be launched in December and will deliver superior mobility solutions across Europe, Africa, Central Asia, and the Middle East.
NASA had previously selected Axiom for three private astronaut missions to the station.
Ali al-Qarni and Rayyanah Barnawi will part of the four-man crew Axiom-2 mission to blast off in May from the Kennedy Space Center in Florida.
Al Neyadi is the second Emirati to travel into space, following on from Hazza Al Mansouri's eight-day stay on the ISS in September 2019.
The astronauts arrived at the Kennedy Space Center at 9.30 p.m. UAE time aboard a Gulfstream jet from their home base in Houston.
The two mission specialists, Ali Alqarni and Rayyanah Barnawi from Saudi Arabia, are members of the inaugural Saudi national astronaut programme.
Axiom Space is currently preparing for that first private astronaut mission, Ax-1, which is scheduled to launch no earlier than February 21, 2022.
SpaceX wants to envelope Earth with up to 42,000 satellites.
