The company, started by the Amazon founder Jeff Bezos, reset its countdown clock repeatedly over a period of just over two hours before eventually postponing the test flight to another day.

Blue Origin pushed again its planned debut launch of its New Glenn rocket from the Space Coast, now targeting an early Monday morning liftoff. The 321-foot-tall rocket making its debut on the NG-1 mission is targeting a three-hour window from 1-4 a.

Jeff Bezos’s Blue Origin launched its New Glenn rocket into orbit early Thursday, in a critical milestone that comes some 25 years after the billionaire founded the company with the goal of reducing the cost of access to space.