Photos: Delta 4 awaits blastoff

Elements of the next U.S. commercial cargo-delivery trip to the International Space Station are coming together at Kennedy Space Center for the planned March 10 liftoff.

Two spacewalkers attached a new docking port to the International Space Station Friday, clearing the way for U.S. crew ferry ships being built by Boeing and SpaceX to begin test flights to the lab complex next year.

After receiving more than $150 million in U.S. military funding to design and develop a reusable winged spaceplane named Phantom Express, Boeing said Wednesday it is ending its work on the vehicle, effectively killing a program military officials hoped would offer regular, reduced-cost launch opportunities for small satellites.