New Delhi, March 21 -- A Vancouver-bound Air India flight from Delhi, operated by a Boeing 777 200LR aircraft, was forced to return to Delhi on Thursday evening after flying for over seven hours, as it was found that the aircraft deployed for the service was not approved for operations to Canada, people aware of the matter said. An alleged lapse in updating operational requirements led to the wrong aircraft being assigned to the flight, they said. "Air India flight AI185, operating from Delhi to Vancouver on March 19 returned to Delhi due to an operational issue and in line with established standard operating procedures. The aircraft landed safely, and all passengers and crew had disembarked (safely)," an Air India spokesperson said on Frid...