Message posted by Peter Merlin (Member since 11/13/2003) on March 29, 2021 at 7:02:27 PST:

The first two B-21 airframes are in production now at AF Plant 42. The first will be the initial flight-test aircraft. The second will be used as a structural test article on the ground.

A number of aircraft development programs are now using analytical models called "digital twins" before moving to the hardware stage.

In Reply to: Plant 42 posted by Chris on March 29, 2021 at 6:47:00 PST:

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