Where do the points Vx and Vy intersect for jet aircraft?

The intersection of points Vx and Vy for jet aircraft occurs at the absolute ceiling. Vx is the best angle of climb speed, which provides the greatest altitude gain over the shortest horizontal distance, while Vy is the best rate of climb speed, which provides the maximum altitude gain over time. At the absolute ceiling, the aircraft can no longer climb because it has reached its maximum performance limits in terms of altitude, resulting in a balance where both Vx and Vy intersect.

At this point, the available lift from the wings is equal to the weight of the aircraft, and any attempt to climb further would result in a loss of altitude. Therefore, understanding that the absolute ceiling is where these two speeds converge helps aircraft operators and pilots recognize their limits in terms of climbing performance under specific conditions.