The troubled airliner’s return to the skies won’t be immediate, even with the ungrounding order. The planes will need to be refitted with improvements ordered by the FAA, and pilots will need to be retrained in procedures. American Airlines, one of the largest operators, plans to have the planes flying again on Dec. 29 starting with a single round trip between New York and Miami. The airline recognized some travelers may be hesitant.Chris Woodyard (USA Today)