Which component of the B737 acts as the main thrust-producing part?

The engines of the B737 serve as the primary source of thrust for the aircraft. They are designed to generate the necessary propulsion needed for takeoff, flight, and landing. The thrust produced by the engines is what enables the aircraft to overcome drag and ascend into the air, as well as maintain speed while flying.

In contrast, ailerons are control surfaces that primarily manage the roll of the aircraft around its longitudinal axis, flaps are mechanisms that increase lift and drag during takeoff and landing but do not produce thrust, and the rudder functions to control the yaw motion of the aircraft. While all these components play important roles in flight operations, only the engines are responsible for thrust production.