GeekWire has a long article on Starlink HERE.
. . .This first launch is primarily aimed at demonstrating the technology for what could eventually amount to as many as 11,000 satellites in low Earth orbit.
Musk said only about 400 satellites would be required to build up a “useful” satellite constellation, which translates into about six launches after this mission’s scheduled deployment. Mark Juncosa, vice president of vehicle engineering at SpaceX, said another six launches would provide good coverage over the United States. An additional six to 12 launches would raise the satellite tally high enough to cover the world.
“Within a year and a half, maybe two years, SpaceX will probably have more satellites in orbit than all other satellites combined,” Musk said.
Continues reading HERE.