Hafele–Keating Experiment is so tampered with that it could be considered fraudulent. It was a test of the theory of relativity. In October 1971, Hafele and Keating flew cesium beam atomic clocks around the world twice on regularly scheduled commercial airline flights, once to the East and once to the West. In this experiment, both gravitational time dilation and kinematic time dilation are significant – and are in fact of comparable magnitude. In the Hafele-Keating Experiment, the atomic clock is used to detect the relativistic time effect. As an atomic clock in an airplane, this airplane is vibrating, shaking and jittering.