Plastic wrap causes engine fireShortly after takeoffTire fall off,airplaneOff the runway: These are eight incidents that occurred on United Airlines flights in the past two weeks. Although no injuries or more serious incidents were reported, these incidents haveThe incident was widely reported, raising concerns among federal officials and passengers about aviation safety.

All of the accidents occurred in the United States, and five involved Boeing Co. planes that have come under intense scrutiny. In January, an Alaska Airlines Boeing 737 Max 9 jetliner was forced to make an emergency landing after a door panel flew off during flight.

“I want you to know that these incidents have raised our concerns and sharpened our focus,” he said, adding that the airline was reviewing each incident and that it would impact its safety training and procedures.

Here’s what travelers should know about the latest airplane accidents.

Most of the accidents reported in the past two weeks required emergency landings or diversions.

March 11: OneFrom Sydney, AustraliaBoeing 777 bound for San Francisco derailed after takeoff due to hydraulic failureOil leak and returned.

March 14: OneFlying from Dallas Fort Worth International AirportAirbus A320 aircraft appearsHydraulic oil leakageand landed at its scheduled destination, San Francisco, shortly afterwards.

“Some of these issues occur occasionally but are not usually reported in the media,” Sumwalt said, although he stressed that they are unacceptable.

Kayla Dempsey in Admiral ClaudebergWrite about this on your blogAviation AccidentsIn an article published on Wednesday, she said United’s recent problems were being “wrongly conflated with Boeing’s troubles.”

“While it is unfortunate that United Airlines has had so many incidents in such a short period of time, overall these types of incidents occur frequently around the world and there is no overall upward trend,” Dempsey said.

The 270-word message Kirby sent to United customers, including members of the airline’s frequent flyer program, began on Monday morning, said United spokesman Josh Fried.

Kirby wrote that United pilots will have one additional day of in-person training starting in May, a change that was planned before the accident. The company will also “provide centralized training sessions for our newly hired maintenance technicians” and will devote more resources to the airline’s supply chain.

The Federal Aviation Administration regulates the nation’s aviation system and investigates safety incidents involving U.S. airlines, while the National Transportation Safety Board investigates the causes of incidents, collisions and crashes involving American Airlines planes, as well as other incidents involving commercial and public transportation operators. Both agencies have the power to decide who to investigate, Sumwalt said.

The NTSB is currently investigating a March 8 runway deviation in Houston, a spokesman said. The board is also investigating a Feb. 10 crash of a United Airlines flight.indivualLos Angeles to Newark Flightsthe flight experienced severe turbulence, injuring more than a dozen passengers. (The Boeing 777 operating the flight landed normally but was greeted by medical personnel.)

Security experts say some issues won’t necessarily warrant investigation by both agencies.

For example, it’s common for multiple parts of an aircraft’s hydraulic systems to be damaged, said Michael McCormick, an assistant professor at Embry-Riddle Aeronautical University and a former FAA control tower operator. Sumwalt said the FAA may or may not intervene unless there’s a pattern to the accidents.

The National Transportation Safety Board and the Justice Department are investigating a door panel that flew off an Alaska Airlines plane in January.