Originally Posted by
alanjed
My guess would be N54558 (MSN 12765), which has had three test flights in quick succession. N54558 is the first airframe to come off Airbus's Mobile (BFM) 2nd A320 Production Line.
The other two frames in WIP have only had two flights, and one of them needed and second Engine Run/Taxi Check between its fir and second flights.
Thanks for the update. United has another A320neo being delivered on Tuesday.
UA4214 is a delivery of a new A320neo.