An Air India flight from Frankfurt to Delhi was diverted to Jaipur after the pilot activated transponder code Squawk 7500, the internationally recognised signal for unlawful interference.
The aircraft made an emergency landing at Jaipur International Airport and was escorted to an isolation bay for security inspection.
All crew and passengers aboard the Boeing 787-9 flight were deboarded under security supervision, according to initial reports.
Security personnel screened all passengers and their baggage.