Blue Origin LLC’s new flagship rocket is poised to blast off for the first time in a crucial test of the Jeff Bezos-backed firm’s ability to challenge SpaceX’s ironclad grip on the launch market.

New Glenn, originally intended to launch as early as 2020, is set to lift off as soon as Monday out of Cape Canaveral, Florida, during a three-hour launch window that begins at 1 a.m. local time. That reflects a one-day delay due to sea conditions, according to a post on X.

The mission aims to put a Blue Origin test satellite into orbit and then land the rocket’s lower portion on a drone ship in the Atlantic Ocean.