As the aircraft moves, air flows against its front and subsequently against the yaw string. The yaw string, then, sticks against the helicopter's windshield, either upright or at an angle.

Experience the operational readiness of Ukrainian Army Aviation as they prepare and launch missions in support of ground forces on the front lines.

From the perspective of the helicopter cockpit, the lights of the incoming American Airlines jet could have also been obscured by the glow of the city skyline, pilots said.

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The yaw string is a basic instrument with one end attached to the front of a helicopter or a glider, while the other end of the string is free to move according to the aircraft's motion.