Boeing HorizonX Ventures, the venture capital arm of aerospace company Boeing Co., led a growth funding round for Robotic Skies LLC.

Robotic Skies is a services provider that links commercial unmanned aircraft systems manufacturers and operators with civil aviation authority-certified repair stations.

Other round participants included Thayer Ventures, Sun Mountain Capital Advisors LLC and Kickstart Seed Fund.

The transaction builds on a partnership among Robotic Skies, Boeing Global Services and its subsidiaries Aviall Inc. and Jeppesen to offer improved commercial unmanned aircraft systems services.