There was minor damage to the wings of both aircraft, although no one on either of the planes was injured.
Inside Obama's plane, the hit was so small that no one realized they had clipped the other plane's wing until someone on the plane, looking out the window, noticed the swipe.
The plane, because it was taxiing and heading to park, was not under the control of air traffic controllers at that point.
Members of Obama's campaign staff, Secret Service members and two crew members were flying along with the senator.
Before leaving his Las Vegas event that evening, Obama commented that he only had one hour to speak to the crowd, so his pilot wouldn't get "cut off" and so he wouldn't get in trouble with his wife. Obama will be in Chicago today, enjoying a prescheduled day off with his family.