The Leo Atlas 07 mission was the second to last flight that Amazon booked on a United Launch Alliance Atlas 5 rocket. Liftoff from pad 41 at Cape Canaveral Space Force Station happened at 7:53 p.m. EDT (2353 UTC).

The static fire test was conducted by Northrop Grumman, the manufacturer of the GEM 63XL solid rocket booster that can be used to help power United Launch Alliance’s Vulcan rockets. An in-flight anomaly was observed on one of those back in mid-February.

A pair of launches this week pushed the number of Amazon Leo satellites deployed to more than 300, but the company is still far short of a looming FCC milestone.

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The mission, dubbed Amazon Leo 6 by United Launch Alliance and Leo Atlas 6 (LA-06) by Amazon Leo, is the 10th batch of production satellites launched to orbit. Liftoff from pad 41 at Cape Canaveral Space Force Station is scheduled for 8:52 p.m. EDT (0052 UTC), the opening of a 29-minute window.

An Atlas 5 launched the latest set of satellites for Amazon’s broadband constellation April 4 as the company seeks to accelerate deployment of its spacecraft.

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Liftoff from pad 41 at Cape Canaveral Space Force Station happened Saturday at 1:46 a.m. EDT (0546 UTC).

The company came under new leadership in December following the departure of Tory Bruno, who left the company to join Blue Origin.