Maiden flight of Endeavour. #OTD in 1991, space shuttle Endeavour lifted off from launch pad 39B to begin STS-49. This was the first U.S. orbital flight to have four extravehicular activities, and the first with three crew members working simultaneously outside the spacecraft. pic.twitter.com/tNfOAKxdWZ

🔴 LIVE launch coverage of @Commercial_Crew’s Boeing Crew Flight Test starts now! Have a question? Use #AskNASA! Liftoff is targeted for 10:34pm ET from Space Launch Complex-41. twitter.com/i/broadcasts/1BRJjPvrEjpKw

Propellants are now flowing into Falcon 9 at pad 40

From the pad and into space and back! 🚀💫   This is the first flight of the NASA Boeing Starliner spacecraft. We are ready to fly the NASA Boeing Crew Flight Test!!   Liftoff is targeted for 10:34pm ET with live coverage starting at 6:30pm ET. pic.twitter.com/pegZtpdLwV