Air traffic controllers at airports in the D.C. area made a record number of mistakes in 2010, according to a Washington Post report.
Air traffic controllers made 52 errors this year, compared to 21 in 2009, according to The Post. Most of the incidents were near misses, where planes got too close.
The most recent error was on Christmas Eve, when a controller mistakenly put two airplanes approaching Baltimore-Washington International Thurgood Marshall Airport on converging paths.
Nationally, errors by air traffic controllers increased by 51 percent.
The Federal Aviation Administration now wants to require new software to help prevent these mistakes.
