No-fly zone status for all N-sites?

The ever-increasing security threat to Indian nuclear establishments could lead to almost all of them being declared no-fly zones to avoid the possibility of any plane crashing into them in a repeat of the 9/11 attack. National security adviser M K Narayanan is learnt to have written to the Prime Minister's Office to consider a no-fly zone status for these sensitive establishments, a copy of which was sent to the aviation ministry for technical evaluation recently.