Three senior Democratic lawmakers on Tuesday urged the Federal Aviation Administration to address significant safety issues at Reagan Washington National Airport and maintain reduced air traffic after a series of troubling incidents.

The FAA is addressing helicopter and passenger plane collisions at Las Vegas airports to enhance air safety and compliance.

A Federal Aviation Administration report warned of dangerous conditions at Harry Reid International Airport in Las Vegas, Nevada, due to the prevalence of air tour helicopters. The FAA said it reviewed dozens of airports in the wake of the collision between an American Airlines jet and an Army Black Hawk helicopter outside Washington,