New Delhi, June 16 -- An Air India flight from Delhi to Zurich was delayed on Sunday due to mandatory checks on Boeing 787-8 aircraft, resulting in its late arrival in Switzerland close to the night curfew, sources said on Monday.

The delay was not due to any technical issue but the mandatory checks ordered by government. The return flight is scheduled to operate as planned, sources clarified.

Earlier in the day, in a separate incident, an Air India flight, which was supposed to land in Delhi, was diverted back to Hong Kong after the pilot suspected a technical issue mid-air, according to sources.

The AI 315 flight, a Boeing 787-8 Dreamliner, had departed from Hong Kong to Delhi. According to the flight tracking site, Flight Radar 24, ...