BOEING 737-8H4SOUTHWEST AIRLINES CO

Southwest Airlines flight crew’s misjudgment of the distance required to safely pass the American Airlines airplane.

the flight crew's misidentification of the taxiway as the landing runway.

the early rotation of the airplane to an angle at which the fuselage contacted the runway. Contributing to early rotation was the Captain’s reaction to the erroneous V1 automated callout, likely assuming that the airplane was at or close to the correct Vr at the same time. The erroneous automated callout was likely due to a keystroke entry error by the FO when manually entering takeoff data for a newly assigned departure runway.

the flight crews failure to perform a takeoff performance data briefing following the final entries into the Flight Management System, which would have alerted them to the incorrect weight entry and resulting incorrect landing speeds. Contributing to the accident was the failure of the flight crew to recognize and respond to various visual cues indicating the airplane's airspeed was too slow, resulting in a higher than normal pitch during landing and the tail of the airplane striking the runway.

an inadvertent loss of airspeed and increased pitch attitude prior to touchdown.