Their only hope of returning to the present day is to increase altitude and speed in an attempt to catch the same "freak jet stream" and to return to 1961. At first, it appears to work; after another flash of light and violent shaking, New York City is once again visible, and although they still cannot contact Idlewild, they are able to reach LaGuardia Airport. However, the air traffic controller on the radio does not understand references to Idlewild or to current aircraft technology such as VOR, ILS and jet aircraft. The controller eventually clears the aircraft to land at La Guardia, but orders the captain to report to the Civil Aeronautics Administration (CAA) office afterward; the captain remarks that they haven't called the Federal Aviation Administration by that name in years. The copilot spots the buildings and structures from the New York World's Fair of 1939 and 1940 below. They have come forward in time, just not far enough.