Why is the Delta Wing not used on the passenger aircraft while it is frequently used in combat aircraft?

The shape, size and position of the wings on the hull significantly affect the characteristics of the aircraft (eg speed, balance, buoyancy, maneuverability). The wings can be straight, forward or backward curved or triangular.

Flat blades are advantageous in that they generate high buoyancy at low speed. However, these wings are not suitable for high speed aircraft. Since the flow direction of the air is perpendicular to the wing in flat wings, the friction force created by the air is high.

Today, aircraft that move at high speeds often use backward curved blades. The air friction formed in this wing design is low. This allows the planes to move at higher speeds. However, in aircraft with backward curved blades, flight at low speeds is not balanced. In this design, how far the wing is tilted backwards significantly affects the characteristics of the aircraft. Wing slope is balanced in commercial passenger aircraft. In this way, both air friction is low and flight at low speeds is balanced. The blades, which are significantly curved backwards, are mostly used in combat aircraft. Since the flight is not balanced at low speeds in this wing design, warplanes move at high speed while taking off and descending.

The delta wing design can actually be regarded as the improved form of the backward curved wing design. When viewed from above, the wings appear in the shape of a triangle in the back of the aircraft. It is mostly preferred in aircraft that move faster than sound, such as fighter aircraft. The shock wave that occurs when the sound velocity is exceeded causes the friction force acting on the wings to increase significantly. The reason why delta wings are preferred in aircraft that can move faster than sound is because they are less affected by the increase in air friction due to the sound wall that occurs when the aircraft is at the speed of sound. The Delta wing has been used on two commercially available passenger planes (Concorde and Tupolev Tu-144) to date. However, there is no supersonic passenger plane that is in service today, which is moving faster than sound.