Approach and Distractions
The flight crew reported a heavy traffic period with air traffic control using parallel runways. They were vectored onto a longer than normal final approach and slowed down earlier than usual. To maintain the assigned airspeed, they selected 25 degrees of flaps but delayed landing gear extension due to their distance from the runway. During the approach, numerous genuine and 'phantom' Traffic Collision Avoidance System (TCAS) traffic alerts were received, which distracted the crew from the checklist.
GPWS Warnings and Confusion
At 500 feet above ground level (AGL), the Ground Proximity Warning System (GPWS) began to sound 'whoop whoop terrain'. The crew stated they were distracted by all the noise in the cockpit and confused by the 'terrain' message from the GPWS. The GPWS was automatically inhibited at 50 feet AGL, at which point the crew recognized the landing gear was not extended.
Go-Around and Tail Strike
The crew executed a go-around, and during the maneuver, the aft fuselage struck the runway.