The NTSB has brought in a glass specialist to try to figure out why 14 airplane windshields cracked during an hour-and-a-half at Denver International Airport last Friday afternoon. "We believe it is very remarkable to have this number of events in the same area at the same time," FAA spokesman Allen Kenitzer told The Denver Channel. Some of the aircraft were taking off, some were landing and some were parked at various locations on the airfield. Weather at the time was variable, with temperature changes, some snow and high winds gusting over 50 mph, the Denver Post reported. However, no damage was found to airframes, which seems to rule out windborne debris as the culprit. "It's baffling," DIA spokesman Chuck Cannon told The Denver Channel. The cracks affected 22 front and side windshields, which have been removed from the aircraft and will be inspected by NTSB investigators. Nine of the aircraft were operated by SkyWest Airlines, four by Frontier Airlines and one from Great Lakes Airlines.