Biplane

Equalist Airplanes are quick-maneuvering aircraft that are capable of flight and delivering powerful bombs and torpedoes, as well as rearward firing bolas for defense against other aircraft. They have three engines, one in 'pull' configuration on the front of the fuselage, as well as one in 'push' configuration mounted under the edge of each upper wing. They were engineered by Hiroshi Sato.

History
Upon the arrival of the United Forces in Republic City's harbor, several Equalist biplanes began flying towards the fleet, launching bombs and torpedoes at the battleships. One of these biplanes was being flown by Hiroshi Sato. During the battle, General Iroh launched a number of firebending blasts towards a biplane that was headed straight for the helm of his ship, but was tossed into the harbor by an explosion caused by one of the biplane's bombs. After the battle, the Equalist biplanes emerged victorious, having successfully destroyed the entire fleet of United Forces battleships.

Later on, General Iroh, who had been rescued by Korra, sent a wire to Commander Bumi, telling him not to bring the second wave of reinforcements any closer to the city until he had taken care of the biplane problem. Iroh, Bolin, and Asami then discovered the location of the Equalist's airfield, and decided to infiltrate the base. Upon their arrival, however, the group was captured and imprisoned. While in the cell, the group was visited and told by Hiroshi Sato that he had intercepted General Iroh's transmission, and that he knew exactly where Bumi's fleet was hiding, and that he planned on destroying the fleet. A few moments later, after Hiroshi had left, Naga broke into the base and freed Iroh, Bolin, and Asami from their cell. The group then headed outside, towards the airstrips.

Upon reaching the airstrips, General Iroh decided to go after a biplane that was preparing to take-off. By utilizing his firebending in a manner similar to jet-propulsion, Iroh managed to catch up to the moving biplane and hi-jack it, causing the Equalist pilot to bail out and deploy his parachute. Although Iroh found the biplane difficult to control at first, he eventually managed to catch up with the rest of the fleet, and began attacking the other planes. Although he was doing well at first, Iroh's plane destroyed when another biplane launched a bola at his engine, causing the engine's blades to stop rotating. Iroh then utilized his firebending once more to propel himself onto the wing of another biplane. Once on the wing, he launched another fireblast, which destroyed the engine of a biplane in front of him. Iroh then successfully hi-jacked the current plane he was on. His luck didn't last very long, however, as his new biplane was attacked and damaged by a biplane that had dropped a bomb on him from above. Before the attacking biplane had the chance to drop even more bombs, however, Iroh launched an upward firebending blast, causing the bombs to detonate in the attacking plane's bomb bay, effectively destroying the plane. Soon after this success, however, Iroh was forced to abandon his biplane, as it was headed straight for the statue of Avatar Aang on Aang Memorial Island. After Iroh jumped out of the biplane and grabbed onto the Equalist banner hanging from the statue's staff, the plane he had stolen crashed into the statue's head, causing the giant Amon mask to fall off.

Back at the airfield, Bolin had utilized his earthbending to destroy the individual airstrips, thus stopping any more biplanes from taking off.

Design
The Equalist biplanes have three engines, one in 'pull' configuration on the front of the fuselage, as well as one in 'push' configuration mounted under the edge of each upper wing.

The biplanes are also equipped with various weapons for combat. Located on the underside of the aircraft is a bomb bay that, when opened, will drop a number of powerful bombs on the targeted areas. In addition, the biplanes are also capable of fire torpedoes that, once in the water, will travel straight until coming in contact with another object, causing them to detonate.

The biplanes are also capable of shooting bolas from behind, which can become entangled in the engines of an enemy plane, effectively causing them to fall from the sky.

Design
These airplanes have a biplane configuration with bomb bays to carry several bombs. They also have wing racks to carry torpedos for submerged crafts.

Weaknesses
Due to their relatively small size and little defense, the biplanes can be easily destroyed when they are hit, which makes them useless and need to be aborted.

Trivia

 * Upon seeing the biplanes flying towards Republic City's harbor, Bolin rhetorically asked Asami how her father managed to find the time to continuously create "evil machines".
 * The aircraft's design has similarities to the Airco DH.4, a British airplane designed for bombing during World War I.
 * While it is a biplane, the bent wings on the bottom wings and the fact that it is a bomber can be compared to a Stuka dive bomber, an aircraft that served with Nazi Germany, another organization that gave off hatred toward a specific group of people.
 * The fact that the plane's landing gear doesn't retract after takeoff is typical of early aircraft.