Article in Times of India - says its tough for the aircraft to fly over Indian mainland. Not a surprise, but thought I'd share it here for some interesting quotes from spokespersons:
Link to the article
According Guild member Sushil Mondal, all hell would break loose if the IAF detected an aircraft that did not have air defence clearance. Any plane flying through Indian airspace is first required to submit the flight plan and manifest to the air traffic controls in its flight path. This is then relayed to the air force for permission.
"There are times when the Air Force finds a blip that does not match a flight plan. That usually happens when flight plans going missing at their end due to a system or link failure. They then immediately contact us for information. If the plane flight plan isn't of suspicious nature, a clearance is granted. Or else, it is asked to return to wherever it came from. In case, we too don't have any information of the aircraft, there will be trouble and the Air Force scramble jets to take the plane down. Nothing of the kind happened last Saturday," said Mondal.
Recently, the IAF scrambled a Su-30MKI in the western sector after noticing an unidentified 'blip' crossing over from Pakistan, It turned out to be a weather balloon.