Hylas 4 will deliver up to 28 gigahertz of throughput to 66 fixed beams plus four steerable beams.
The two satellites are the Hylas 4 spacecraft to be built for Avanti Communications and the Al Yah 3 satellite for Yahsat.
The Intersputnik satellite telecommunications organization is negotiating with several satellite fleet operators on joint ventures using Intersputnik orbital slots and frequency reservations.
Orbital Sciences will launch its next cargo delivery mission to the international space station no earlier than June 17.
A Brazilian government auction of four satellite slots has garnered $67.6 million in winning bids.