The federal agency opened an audit into runway incursions which is examining 45 of the nation’s busiest airports. Though the FAA Administrator said last month that the number of serious runway mishaps had fallen by over 50% this year, a recent incident involved a Delta plane clipping the back of a smaller regional jet in Atlanta.

The Federal Aviation Administration announced they’d be auditing the country’s 45 busiest airports after a rash of near collisions, and some actual collisions, at airports in the United States sparked concern.