Photos: Delta 4 awaits blastoff

Spare parts warehoused in the the United States and Russia will help Boeing finish assembly of a third space station docking port to receive arriving astronauts aboard Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon capsules, replacing a unit lost in a Falcon 9 launch failure last year.

A day before blastoff with two Intelsat communications satellites, an Ariane 5 rocket rolled into position on its launch pad in French Guiana on Tuesday behind a 540-horsepower Titan truck, and these close-up snapshots show technicians preparing for the journey.

Boeing said Monday it has re-qualified software for the company’s Starliner crew capsule after programming errors cut short the spacecraft’s first orbital test flight in 2019, and technicians at the Kennedy Space Center have connected the crew and service modules for the next unpiloted Starliner test flight to the International Space Station in March.