NEW DELHI: Pakistan’s crossborder troubles are giving nightmares to pilots of Indian carriers landing into airports very close to the Line of Control — Jammu and Thoise Air Force base.When aircraft are in final approach for landing, hackers from across the border often tap into the frequency on which pilots are in touch with Jammu air traffic control ( ATC ). They block this communication and start transmitting Pakistani patriotic songs on the frequency which play out in the cockpits. While all scheduled airlines fly to Jammu, only Air India operates Army charters to the forward base located at Thoise.This defence airport does not get any scheduled flights. “We are made to hear songs like ‘Dil, dil Pakistan, jaan jaan Pakistan.’ Hacking of our frequency has been happening for some time now. In such a situation, we revert to the Northern Control in Udhampur . This IAF-run ATC coordinates with aircraft when they are over 10,000 feet high and on descending below that level, we switch over to the Jammu tower,” said a senior pilot who flies to high altitude airports. The Northern Control calls up the Jammu ATC on landline and gets alternate frequency from them. It then tells pilots to speak to Jammu on that frequency.Unable to quickly hack into the alternate frequency, pilots get time to land into Jammu or Thoise by being in touch with the ATC. “We use VHF, which is line of sight communication and is known as ‘if you can see us, you can talk to us.’ Due to this, hackers frequently jam our frequency with ATC and start playing their music. This is a big irritant as we are in final stage of landing,” said another pilot. Due to this reason, the Jammu ATC frequency is changed very frequently to minimize cross-LoC hacking.Pilots landing into Jammu and Thoise have to anyway be extremely careful as while manoeuvring to land at the runways there, they pass very close to the LoC.