Full article: http://www.satellitetoday.com/launch/2016/04/27/launcherone-to-start-test-missions-in-2017/

In addition to OneWeb, Virgin Galactic won a Venture Class Launch Services (VCLS) contract from NASA last year. Both these customers have target launch dates in 2018. Virgin Galactic also recently secured a Letter of Intent (LOI) from Millennium Space Systems for using LauncherOne, and when the company announced LauncherOne in 2012, it mentioned GeoOptics, Spaceflight Inc., Planetary Resources and Skybox Imaging (now Terra Bella) as interested customers. Whitesides declined to say how many customers Virgin Galactic has for the launch vehicle, but described the missions as very diverse.