When senators grilled the Federal Aviation Administration last week about how the agency could have let the high number of close calls between helicopters and commercial jetliners occur at Ronald Reagan Washington National Airport,

In the aftermath of the tragic midair collision over the Potomac River in Washington, D.C. in January, authorities have been working hard to making operations at Ronald Reagan Washington National Airport safer.

The Federal Aviation Administration (FAA) is investigating a close call that occurred on Friday between a Delta Air Lines flight and a U.S. Air Force jet near Reagan Washington National Airport