Amazon was ready to take another big step toward building its space-based internet network, Project Kuiper. A powerful rocket stood tall on the launch pad at Cape Canaveral, Florida, filled with 27 internet satellites and prepared for liftoff.

United Launch Alliance scrubbed Monday an attempt for what would have been its second launch of the year, another mission for Amazon’s effort to compete with SpaceX’s Starlink internet

Amazon has tabbed ULA to launch more than half of the planned 3,200-plus satellites for its $10 billion Project Kuiper internet constellation.