The ground stops were prompted by severe weather in the region.
The Transportation Security Administration broke the previous year's record for intercepting firearms at the nation's airports. More than 2,600 firearms were found in carry-on bags brought to security checkpoints.
The Transportation Security Administration says agents detected a firearm in someone's carryon luggage at BWI airport for the 16th time this year, up from 14 last year. Maryland authorities charged the Frederick County man for illegal possession of a handgun.