Earlier, in the day, U S Embassy officials were working with the Ministry of External Affairs, the Director General of Civil Aviation and the Indian Air Force to carry out the necessary paper work to clear the release of the plane.
The pilot of the aircraft failed to ascertain the correct AOR signal when asked for it by the air traffic controller. The aircraft was asked to land after its call sign was not registered.
The aircraft was traveling from Fujairah in the United Arab Emirates to Bangkok. A call sign is a signal code that all foreign military aircraft crossing Indian airspace use to communicate with the Indian Air Force.
In June, a Russian AN-132 aircraft, hired by the North Atlantic Treaty Organisation forces working in Afghanistan was forced to land in Mumbai airport on similar circumstances.