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ULA scrubs Vulcan's Amazon Leo launch hours before liftoff, retries Saturday
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ULA's Vulcan Centaur was due to return to flight with 40 Amazon Leo satellites, but a propellant supply problem forced the mission to be postponed to Saturday. Takeoff will also test an improved nozzle after two anomalies in solid thrusters.
ULA scrubs Vulcan's Amazon Leo launch hours before liftoff, retries Saturday
The 40 satellites on board are the largest single Leo batch Amazon has launched, on a rocket carrying over 50,000 pounds. Amazon has put nearly 400 Leo satellites in orbit since April 2025, but hasn't launched any since July.
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