5 spare satellites for the Iridium NEXT constellation and 16 satellites for the OneWeb constellation (15 of current generation and 1 demonstration satellite for the next generation) on a share-ride.

Falcon 9 is a two-stage rocket designed and manufactured by SpaceX for the reliable and safe transport of satellites and the Dragon spacecraft into orbit. The Block 5 variant is the fifth major interval aimed at improving upon the ability for rapid reusability.

Space Exploration Technologies Corp., known as SpaceX, is an American aerospace manufacturer and space transport services company headquartered in Hawthorne, California. It was founded in 2002 by entrepreneur Elon Musk with the goal of reducing space transportation costs and enabling the colonization of Mars. SpaceX operates from many pads, on the East Coast of the US they operate from SLC-40 at Cape Canaveral Space Force Station and historic LC-39A at Kennedy Space Center. They also operate from SLC-4E at Vandenberg Space Force Base, California, usually for polar launches. Another launch site is being developed at Boca Chica, Texas.

• OneWeb

  Communication Constellation
  Satellite constellation in low Earth orbit that can provide high-speed broadband internet to rural and isolated areas.
  Program infoProgram wiki
• Iridium Constellation

  Communication Constellation
  The Iridium satellite constellation provides L band voice and data information coverage to satellite phones, satellite messenger communication devices and integrated transceivers.
  Program infoProgram wiki