In fact, 'alert' crew of another Jet flight just ahead of this one came to the rescue of the out-of-reach crew of the flight from Mumbai (9W 118).The German ATC contacted a Delhi-London flight of Jet Airways (9W 122), which was flying ahead of 9W 118 last Thursday (Feb 16). The crew of the flight from Delhi contacted Jet Airways' flight operations in India which then used the aircraft communication and addressing system (ACARS) or a satellite phone to contact the pilots of 9W 118. Due to this, the other pilot could not be reached by the German ATC - due to wrong frequency. While flying from Bratislava to Prague, 9W 118 was on correct frequency as it transmitted and acknowledged messages from the ATC. By this time fighter jets had been scrambled for 9W 118.

Source: Times of India February 20, 2017 20:01 UTC