<span style="color: #222222;">United States aviation regulator FAA has warned American airlines and their pilots that there is risk involved in operating flights in Pakistan airspace due to extremist or militant activity. </span><br />'' <br />'' <span style="color: #222222;">The US Federal Aviation Administration in a notice to airmen has said there continues to be a risk to US civil aviation sector from attacks from airports and aircraft in Pakistan. </span><br />'' <br />'' <span style="color: #222222;">This is particularly for aircraft on the ground and aircraft operating at low altitudes, including during the arrival and departure phases of flights.</span><br />'' <br />'' <span style="color: #222222;">The FAA said some reports suggested that extremist or militant groups operating in Pakistan are suspected of having access to man-portable air defense systems or Manpads.</span><br />'' <br />'' <span style="color: #222222;">The regulator added that pilots or airlines must report safety or security incidents which may happen in Pakistan to the FAA</span><span style="font-weight: bold;">.</span><br />