An aircraft is down in the Potomac River near Ronald Reagan Washington National Airport, authorities said after a suspected collision late Wednesday. It was not immediately clear if there are fatalities. Video circulating on X appeared to show a midair collision.

MLK Day will be observed on Monday, Jan. 20 this year. U.S. Postal Service post offices will be closed on Monday, Jan. 20, and mail will not be delivered on the day, the USPS told USA TODAY. The USPS will resume regular operations on Tuesday, Jan. 21.

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The close calls coincide with a shortage of air traffic controllers that has delayed flights and raised safety concerns across the United States. The FAA in October opened an audit into runway incursion risks at the 45 busiest U.S. airports after a series of near-miss incidents.

There are many questions online about how the fatal crash between a passenger jet and Army helicopter. Here’s what we can VERIFY so far.

DCA is one of the most demanding airports in the world. It also has what’s known as ‘helicopter alley’ with hundreds of police, military, news and rescue helicopters criss-crossing

Texas, on Thursday cautioned against jumping to conclusions about what caused a tragic midair collision between an Army helicopter and a passenger jet landing at Ronald Reagan

President Trump blamed diverse hiring policies for a deadly mid-air collision between a commercial jet and an Army helicopter that killed 67 people

Three months before the fatal mid-air collision at Reagan National Airport, the Federal Aviation Administration launched an audit of near-misses at the nation’s busiest airports after a series of close calls that could have killed hundreds of passengers.

There have been a number of close calls around the country in recent years that concerned aviation experts and officials.

The airspace around Ronald Reagan Washington National Airport has long been problematic due to heavy military and commercial flight activity in the nation’s capital, according to industry insiders.

US airlines had gone 16 years without a fatal crash until Wednesday night. But as impressive as that safety record had been, there have been warning signs in recent years of a significant risk of a collision like the one that just killed 67 people.