Air India flight AI 2957 triggered a hijack alert at 8:40 PM after taking off from Delhi's IGI Airport.
The aircraft's transponder sent a 'squawk 7500' code - an emergency signal indicating unlawful interference.
Despite the pilot clarifying it was a false alarm, full security protocols remained active as per aviation rules.
A central committee was formed with representatives from Delhi Police, CISF, AAI, BCAS, and Air Force.
The flight carrying 126 passengers landed safely in Mumbai at 9:47 PM under high alert.
Mumbai airport declared full emergency at 9:30 PM with NSG and local police deployed.
The aircraft was directed to an isolation bay where passengers waited for an hour before deboarding.
The emergency signal lasted for three minutes after takeoff, prompting immediate security response.
Aviation authorities including DGCA and BCAS have launched an investigation into the incident.
Initial reports suggest a possible technical glitch with no indication of crew involvement.