This is when you don't respond to ATC

Jet Airways Boeing 777-300, registration VT-JEX performing flight 9W-118 from Mumbai "India" to "UK" London Heathrow, was enroute at FL360 about 20nm north of Cologne "Germany" when the aircraft was intercepted by two fighter aircraft due to loss of communication.
The crew did not respond to any calls on assigned ATC frequencies and the emergency frequency.
Date: Feb 16th 2017
Video: Mark Stewart©