Tanker aircraft are specialized planes designed to refuel other aircraft in mid-air. They play a crucial role in extending the range and endurance of military and civilian planes, allowing them to fly longer missions without needing to land for fuel. These aircraft can carry large amounts of fuel and are equipped with hoses or pods to transfer fuel to receiving aircraft. Commonly used by military forces, tanker aircraft support operations such as air combat and humanitarian missions. Examples include the Boeing KC-135 Stratotanker and the Airbus A330 MRTT. Their ability to refuel multiple aircraft simultaneously enhances operational flexibility and efficiency.