ARDMORE, Okla. (KXII) Just before 3 p.m. Monday afternoon, residents in Carter County heard a big boom that shook buildings and cars.
Ardmore resident Pamela Rhodes was at home on her lunch break when it happened.
"And I heard a very loud noise that was startling," Rhodes said. "It startled me."
People experienced noise and shaking as far as Wilson and Ravia.
"I thought 'What is this? Is this an earthquake?' Because we do have them in Oklahoma," Rhodes said.
While the U.S. Geological Survey said there was no earthquake Monday, officials with Lockheed Martin Aeronautics in Fort Worth, TX attribute the big boom to two F-35 Lightning II jets flying near Ardmore.
One plane left Fort Worth at 2 p.m. and the other at 2:30 p.m.
Ken Ross, spokesman for Lockheed Martin, said jets regularly perform supersonic flights in the Ardmore area, which has been designated by the FAA for Lockheed Martin to test aircraft.
"Sometimes there are atmospheric conditions that those sonic waves tend to reverberate down to the ground and create some of the noises people heard (Monday)," Ross said.
Ross said Lockheed Martin is focused on flying in specific patterns to have minimal impact on folks in the area.
"It's not something we like to hear when people hear that," Ross said. "Unfortunately, sometimes it is out of our control with the atmospheric conditions."
Ross said people in Carter County can expect sonic booms in the future since the company regularly flies aircraft in the north Texas and southern Oklahoma.