In the experimental sticky it says "They flew atomic clocks on commercial airliners around the world in both directions, and compared the time elapsed on the airborne clocks with the time elapsed on an earthbound clock (USNO). Their eastbound clock lost 59 ns on the USNO clock; their westbound clock gained 273 ns; these agree with GR predictions to well within their experimental resolution and uncertainties (which total about 25 ns). By using four cesium-beam atomic clocks they greatly reduced their systematic errors due to clock drift." But it seems this does not match SR. Two planes take off from say New York City. One flies at a speed of a commercial airliner on some path, the other flies at the same speed on a different path. They both return to the starting point each having traveled the same distance at the same speed as seen by the observer that stayed on the ground in New York. But the two clock do not show the same time dilation! What does this mean?