The Air India flight fell from the sky on Thursday and killed at least 270 people in Gujarat state, officials said Saturday.

The trade event is a big draw for the industry every year, as Boeing, Airbus and other aerospace giants host parties, sign deals and show off new aircraft.

Indian authorities have ordered what they called “extended surveillance” of all Boeing 787 aircraft in the country’s fleet while they investigate the cause of the Air India crash.

Air India said it has completed such safety checks on nine of its Boeing 787 aircraft and is in process to complete it for the remaining 24 planes.

The crash happened just weeks after the company cut a deal with the U.S. government to avoid taking criminal responsibility for a pair of deadly crashes in 2018 and 2019.

It’s also the latest disaster to hit the beleaguered American aerospace giant — which has been dogged by a door that blew off a 737 jet, a leaky spacecraft that stranded astronauts on the International Space Station for months, as well as politically damaging delays in outfitting the new Air Force One jets.

Tragedy struck this week when a plane crashed in the city of Ahmedabad just shortly after takeoff, leaving investigators and aviation officials with many questions.

An Air India plane crashed into a medical college in Ahmedabad, killing people on the ground and leaving a sole survivor on the flight. Authorities said 269 died.