The Boeing Starliner successfully docks with the ISS following a delayed attempt due to a thruster problem.

• On Thursday, the International Space Station received a delayed docking from Boeing's Starliner capsule.
• For the first time, two U.S.-built crew spacecraft are docked at the ISS, with Boeing's capsule joining SpaceX's Dragon.
• An initial attempt by NASA to dock the Starliner spacecraft was delayed due to the failure of five out of 28 thrusters, but four were retrieved to allow for a second docking attempt.

The International Space Station received a delayed docking from a Starliner capsule on Thursday, following NASA's cancellation of an initial approach due to a thruster issue.

The spacecraft docked with the ISS at 1:34 p.m. ET.

The ISS now has two U.S.-made crew spacecraft, Boeing's Starliner and SpaceX's Dragon capsule "Endeavour," docked for the first time.

NASA flight controllers cancelled a planned approach to fix problems with Starliner's propulsion system. Starliner's RCS engines, consisting of 28 jets, enable the spacecraft to make minute movements in orbit.

Four of the malfunctioning jets were recovered by NASA after testing, while five jets remained unoperational.

NASA's flight controllers assisted Butch Wilmore and Suni Williams in testing the thrusters to restore the spacecraft's full propulsion system.

NASA's CAPCOM Neal Nagata informed Wilmore and Williams that the 12:15 p.m. docking attempt was canceled because of a spacecraft control problem, which has a zero tolerance on the ISS.

While diagnosing the problematic thrusters, CAPCOM Nagata instructed the astronauts to maintain a distance from the ISS beyond the "keep out sphere," an invisible boundary that safeguards the spacecraft.

On Wednesday, Boeing's Starliner successfully launched for the crew flight test, marking the first time the capsule carries astronauts to space. This mission signifies the final major step before NASA approves Boeing to fly crew on operational missions.

NASA has shifted its focus on SpaceX's Dragon, with the spacecraft now viewed as a backup option for the agency's astronaut missions.