Photos: Atlas 5 rocket powers NROL-52 payload to space

Here’s a look by the numbers of the previous Delta 4 flight history and the remaining flights of the rocket named Delta.

The U.S. Space Force is planning for an airborne launch of a solid-fueled Pegasus rocket over the Pacific Ocean by early summer after quietly awarding Northrop Grumman a contract for the mission last year.

Launch companies and U.S. Space Force range officials at Cape Canaveral are reassessing long-standing weather rules, looking at beefing up rocket defenses against lightning, and considering strategies to prepare for two different launch windows on a given day to guard against weather delays, something SpaceX may demonstrate with a Falcon 9 launch early Thursday.