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Federal officials say it was probably just some weird weather phenomenon, but a group of United Airlines employees swear they saw a mysterious, saucer-shaped craft hovering over O'Hare Airport in November.

The workers, some of them pilots, said the object didn't have lights and hovered over an airport terminal before shooting up through the clouds, according to a report in Monday's Chicago Tribune.

The Federal Aviation Administration acknowledged that a United supervisor had called the control tower at O'Hare, asking if anyone had spotted a spinning disc-shaped object. But the controllers didn't see anything, and a preliminary check of radar found nothing out of the ordinary, FAA spokeswoman Elizabeth Isham Cory said.

"Our theory on this is that it was a weather phenomenon," Cory said. "That night was a perfect atmospheric condition in terms of low (cloud) ceiling and a lot of airport lights. When the lights shine up into the clouds, sometimes you can see funny things."

The FAA is not investigating, Cory said. |CNN|