With the grounding order rescinded but the FAA, Boeing was getting Max jets ready to go for customers that were in a position to take delivery – namely US airlines and those that use US registered aircraft.  United has a bunch of Max 9 jets on order and one of them was making a test flight just before Christmas.  I got to see it return from its test.  It taxied back in the south entrance to their ramp past a bunch of other test airframes awaiting acceptance.