A SpaceX Falcon 9 rocket fired 60 more Starlink internet relay satellites into orbit Sunday from the Kennedy Space Center with another set awaiting launch Wednesday from the nearby Cape Canaveral Air Force Station.

With Sunday's flight, SpaceX has now launched 835 Starlinks in a rapidly-expanding global network that eventually will feature thousands of commercial broadband beacons delivering high-speed internet to any point on Earth.

The spaceflight company said in an email to local media that the new satellites also had been successfully integrated into the Falcon 9 booster's payload fairing and verified that it would open on space booster launch, which most satellites have to first aloft for launch, putting the Starlink satellite in the process of spinning into orbit.

The 30-story long Falcon 9 booster has now flown 60 times, was built by SpaceX and flew for the first time last month. It rebuilt a traditionally-built capsule that is now being loaded onto the top of the rocket once again.

Late Sunday night, SpaceX forecast that successful restoration of the rocket's first stage engine should allow the first crewed flight of its highly anticipated Falcon Heavy, an upgraded version of the Dragon two-stage spacecraft that debuted last year transporting supplies to the International Space Station and lifting try juggling payloads for large payload days.

Crewed testing will also start with refuelling missions to a facility at Cape Canaveral Air Force Station's Vertical Integration Facility where SpaceX is building the rocket and station's Orion spacecraft.

The Virginia based rocket maker intends to eventually use the Falcon Heavy to round off a $1.6 billion contract with NASA guaranteeing it the right to send astronauts to or from low Earth orbit once again.

Saturday's successful flight was the first flight for Starlink since California-based satellite navigation company Intelsat recently announced it was pulling its network from SpaceX's steady stream of communications for its assistance.

SpaceX agreed a deal in April with Intelsat to launch 17 super-high-speed internet satellites for the U.S. military with Dragon 2.0 capsule, paying $118 million. The defense contract, which is now formally being re-inspected in the wake of the agreement, was not part of that program to exit the Starlink contract.

Intelsat abruptly announced January 18 after returning from a meeting in Brussels, Belgium that it was pulling out of all new NASA contracts that would guarantee launch of its constellation.

Two months later, SpaceX won a $420 million contract from NASA to carry out space station domestic and science cargo delivery missions to a demonstration base in Florida until 2015. A year, or about $15 million of the contract, will be saved as a sign of good faith under a proposed new agency executive department set up by President Barack Obama, underscoring the relatively light supervision NASA will dole out to SpaceX.

The Starlink launch covered several skirting action indications to the company that