Airlines have been increasingly outsourcing repair and upkeep work to other countries, but experts and consumer groups disagree about its impact on safety.

The industry is enjoying a strong demand for tickets and rising profits, but it remains vulnerable to unexpected problems like a recession or a surge in inflation.

A Jeju Air passenger jet carrying 181 people from Bangkok sped off the runway and burst into flames. Two crew were rescued in what was the country’s worst air disaster in decades.

The cause of the crash probably won’t be determined for months, with investigators expected to focus on a wide range of issues.

It is not uncommon for planes to strike wildlife, but most episodes don’t result in deaths or serious injuries.

A plane carrying 181 people crashed while landing, killing most on board. Officials were investigating a possible malfunction with the landing gear and a bird strike.

Nearly 200 airlines use the 737-800, which makes up about 15 percent of the world’s fleet of aircraft.