Flights involving Boeing Dreamliners cancelled on routes including London, Paris, Vienna and Dubai

Air India has cancelled at least eight international flights operated by Boeing 787-8 Dreamliners, the aircraft model involved in the crash last week that killed at least 270 people.

The cancellations on Tuesday affected services to cities including London, Paris, Vienna and Dubai. The airline cited a combination of aircraft unavailability, technical snags, airspace restrictions, and extended safety checks.

At least three other Dreamliner flights have been grounded or delayed in the past 48 hours, as India’s aviation regulator ordered rigorous pre-flight inspections across Air India’s fleet of 33 Dreamliners. A Boeing 777 operating the San Francisco-Mumbai route was also grounded because of a technical hitch.

The disruption came as pressure mounted on Air India and Boeing as the investigation into India’s deadliest plane crash in decades continued. Investigators are pursuing multiple theories, including what some independent experts believe may have been a catastrophic – and extremely rare – dual engine failure.