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It’s a ferry flight with no passengers so that the airline can move the airplane from Florida to California where parking rates are cheaper.

You can apply for a ferry permit from the FAA to get special permission to move a non-airworthy aircraft provided specific conditions are met.

It was a flight without passengers, moving this plane to Victorville CA where it would be stored when grounded.

> edit the playback linked by a different user shows that it was a Max 8. Why wasn't this grounded?

It was, and is. It's just stuck where it was not supposed to be.