India, Jan. 29 -- Air India's Mumbai-bound flight AI 2957 which had taken off from New Delhi's Indira Gandhi airport on Monday sent an emergency signal to air traffic control (ATC) in the Capital, suggesting it had been hijacked. Delhi ATC immediately set in motion a full hijack protocol . Although the pilot informed ATC that it was a false alarm, there was no let up in the protocol. At Mumbai the passengers were allowed to deboard only after the plane was taken to an isolation bay.P9...