A mission to begin populating a new orbital shell authorized by federal regulators earlier this month for the company’s Starlink Gen2 network.

Liftoff of the Falcon 9 rocket from pad 40 at Cape Canaveral Space Force Station on SpaceX’s Starlink 5-1 mission is set for 4:34 a.m. EST (0934 GMT) Wednesday.

The mission will be SpaceX’s 60th launch of the year, with one more Falcon 9 flight set to blast off later this week from Vandenberg Space Force Base, California, with an Israeli Earth-imaging satellite.

There’s a greater than 90% chance of favorable weather for launch Wednesday, according to the U.S. Space Force’s 45th Weather Squadron at Cape Canaveral.

The 54 satellites launching Wednesday will be the first spacecraft deployed into a new segment of the Starlink constellation.

The Falcon 9 rocket will aim to release the 54 satellites at an orbital altitude and inclination set aside for use by SpaceX’s second-generation Starlink network, which the company eventually intends to launch on the new Starship mega-rocket.

SpaceX is developing a much larger, higher-power Starlink satellite platform capable transmitting signals directly to cell phones.

But with the Starship’s first orbital test flight still on hold, SpaceX officials have signaled they will start launching the Gen2 satellites on Falcon 9 rockets.