Updates: Pegasus XL launch scrubbed due to technical issues

Update: Wednesday morning's attempt has been scrubbed due to undisclosed technical issues. A second attempt will be scheduled as soon as teams know more, according to Northrop Grumman, but the earliest possible opportunity would be Thursday morning.

Follow live as an air-launched Northrop Grumman Pegasus XL rocket takes off from the L-1011 Stargazer aircraft during a window that opens at 3 a.m. Teams are targeting 3:05 a.m. for separation and liftoff of NASA's ICON science satellite.