Inmarsat, a provider of global mobile satellite communications services, said it has triggered an option to purchase a fourth Inmarsat-5 satellite under its existing contract with Boeing Satellite Systems International, Inc. The program schedule from Boeing has a satellite delivery date of mid-2016. The fourth Inmarsat-5 satellite will have a dual strategic role. Initially the satellite will serve to provide an early available spare in the unlikely event of a launch failure of any of the first three Inmarsat-5 satellites. As a result, Inmarsat will be able to achieve global service launch for Global Xpress (GX) more rapidly than if a replacement satellite were only commissioned following a launch failure.