Photos: Predawn launch of Atlas 5

A Russian Soyuz rocket launched from French Guiana on Thursday at 1154:53 GMT (7:54:53 a.m. EDT) with the SES 15 communications satellite, a U.S.-built craft designed to support in-flight connectivity, video broadcasts and airborne navigation over North America.

The nation’s existing Atlas and Delta launch sites are vying for a future when United Launch Alliance completes its modernization with a new rocket system and downsizing to one pad on each coast.

The attachment of a mounting bracket for Virgin Orbit’s smallsat launcher under the wing of a modified passenger jetliner portends the start of a series of captive carry tests with a full-scale model of the rocket, culminating in a drop of the vehicle before the first orbital launch attempt.