Blue Origin will try, try again to launch its heavy-lift New Glenn rocket to orbit for the first time — if the Florida weather cooperates.

Blue Origin’s New Glenn rocket is slated for its inaugural launch early Thursday morning from the Cape Canaveral Space Force Station. The 3-hour window opened at 1 a.m.

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.