Lucky them pilots wore not russian.

"On Feb 20th 2017 Air Navigation Services Czech Republic reported, that the actual communication for the hand off from Bratislava to Prague at 15:53Z had been correct (frequency 132.890MHz transmitted and acknowledged), however, the crew subsequently tuned frequency 132.980MHz, the crew did not monitor the emergency frequency. Prague Center spotted another Jet Airways aircraft, flight 9W-122 from Delhi (India) to London Heathrow, flying under control of Rhein Control (Germany) south of the Czech Republic, via Rhein Control and 9W-122 an ACARS message was transmitted to 9W-118 asking them to contact (Prague Center) frequency 132.065MHz. When 9W-118 reported on that frequency at 16:26Z (loss of communication thus lasted for 33 minutes), the aircraft was already in German Airspace and was instructed to contact Rhein Control. Czech ATC immediately informed their military counterpart (Czech control and reporting center) that contact had been re-established."

https://www.aeroinside.com/item/9114/jet-airways-b773-near-cologne-on-feb-16th-2017-loss-of-communication-leads-to-intercept

The crew swapped some digits on channel handover that lead to a comms blackout of 33 minutes. Euro jets already in the air intercepted the passenger jet over Germany and escorted to England.

Those boys and girls don't mess around.