India's aviation safety watchdog said on Tuesday surveillance conducted on Air India's Boeing 787 fleet did not reveal any major safety concerns, days after one of its jets crashed, killing at least 271 people.

Investigators in India are studying the black boxes of a Boeing 787 Dreamliner after recovering them from the aircraft wreckage to ascertain the cause of last week’s plane crash that left at least 270 people dead.

Air India flight AI171, a Boeing 787-8 carrying 242 people, crashed after taking off from Ahmedabad on its way to London.

The DGCA also held a high-level meeting with senior officials of Air India and Air India Express, who are currently operating over 1,000 flights daily across domestic and international sectors. The meeting was convened to review the operational robustness of the airlines and ensure continued compliance with safety and passenger service regulations.

An Air India Boeing 787-8 flight headed for New Delhi returned to Hong Kong shortly after takeoff Monday because of a "technical issue," Indian media reported.

As per flight tracking data, at least nine Air India flights that were to be operated using the Boeing 787 aircraft have been cancelled so far on Tuesday.

The black boxes will provide cockpit conversations and data related to the plane’s engine and control settings to investigators and help them in determining the cause of the crash.