American Eagle Flight AA4647 Diverts to Dulles After Its Crew Reports a Brake Stuck On in Flight

American Eagle flight AA4647 from Buffalo to Ronald Reagan Washington National Airport declared an emergency and diverted to Washington Dulles on Monday, October 12, 2026. The pilots later told controllers an emergency brake had come on in flight and would not release.

The Embraer E175, registration N434YX, is operated for American by Republic Airways. It landed at Dulles at 1:20 p.m. EDT, according to FlightAware, and emergency vehicles met it after landing.

What happened on AA4647

FlightAware’s history for N434YX shows the jet leaving Buffalo Niagara International at 12:19 p.m. EDT. It had already flown into Buffalo from Reagan National that morning.

About half an hour into the flight, the crew set the emergency transponder code 7700, TheTravel reported from tracking data. Instead of continuing to Reagan National, the E175 headed for Washington Dulles International, about 22 miles (36 km) west-northwest of Reagan National.

Air traffic control audio archived by LiveATC, as quoted by TheTravel, has a controller telling the crew after landing to “just hold there, the emergency vehicles will approach the aircraft.”

A pilot then explained the problem: “We had an emergency brake on in-flight; we could not get it to disengage.” The crew asked for the tires to be checked to “make sure none of them are popped,” adding that the brakes were “nice and cool” and that they should be good to taxi once the check was done.

Neither American nor Republic had commented publicly on the diversion at the time of writing, and the number of passengers aboard has not been published.

One passenger wrote on Reddit, in a post TheTravel quoted, that the cabin was told to adopt the brace position for landing and that the touchdown was smooth. That account has not been independently confirmed.

Why a stuck brake changes the landing

If a brake is still applied when a jet touches down, its wheels can meet the runway locked or dragging instead of spinning up freely. That is why the crew’s first request on the ground was a tire check.

TheTravel, citing the E175 operations manual, reported that a tire can burst if a brake stays on during landing. Our explainer on how airplane brakes work covers the systems involved.

Runway length is the other factor, though the crew’s own reasoning for choosing Dulles has not been published. According to FAA airport data, Dulles runway 1R/19L, where TheTravel said the jet landed, is 11,500 feet (3,505 m) long.

The longest runway at Reagan National, by comparison, is 7,169 feet (2,185 m), with 6,869 feet (2,094 m) declared available for landing.

The aircraft and the rest of the day

N434YX is an Embraer 175 flown by Republic Airways under the American Eagle brand. FlightAware shows it had already flown Chicago O’Hare to Reagan National and then Reagan National to Buffalo earlier that day.

FlightAware lists a flight under the same number, operated by an Embraer 170, from Dulles to Reagan National at 8:49 p.m. that evening. American has not said how the AA4647 passengers completed their trip, or whether N434YX has returned to service.