New Delhi, Nov. 13 -- A hijack threat note found in the toilet of a Kolkata-Mumbai flight on Wednesday was written by a 56-year-old passenger who has claimed he wanted to skip an overseas posting by his employer so that he could take care of his ailing wife, police said on Thursday. The man was identified as the author of the note after passengers were made to take a handwriting test at Netaji Subhas Chandra Bose International Airport in Kolkata, where Air India flight AI 2772 was held up for several hours after the security scare. "The passenger who was to fly to Mumbai was handedover to the airport police after his handwriting matched with that on the threat note," an official aware of the matter told HT. The resident of Sodepur in North 24 Parganas was scheduled to board an international flight from Mumbai later in the day, officials said, adding that he was arrested late on Wednesday. The aircraft, an Airbus A320 (VT-TNH), was to depart for Mumbai on Wednesday morning. The handwritten note warning that the aircraft would be hijacked at 11.10am was found in the lavatory by the cabin crew around 10.37am, officials said. Air Traffic Control was alerted and the aircraft was moved to an isolation bay. All 105 passengers and seven crew members were deboarded and the aircraft and baggage were searched. "The wallets of some passengers were also checked. Based on preliminary investigation a man was detained for further questioning," another official said. The man, who worked for a private company, was being sent abroad. "During questioning the man told airport security officials that he was reluctant to go abroad as his wife was ailing. Hence, he left a note in the aircraft's lavatory stating that it would be hijacked, hoping that the threat would delay the flight and eventually force cancellation of his journey," an official said. After security checks were completed, the aircraft departed for Mumbai at 5.38pm....