That is pretty close, for sure. However the analogy that you draw is not quite valid in the incident that is under discussion:
1. People in the neighborhood (of Pearson) are not likely to possess ack-ack guns, RCL guns, Mortars, RPGs and even Kalashnikovs; nor are they desirous of using such weaponry.
2. Contrastingly; (some) people in the vicinity of PAF Peshawar AFB are known to possess such weapons and are certainly likely to want to use them. That record is clear.
3. Airports have been hit in Pakistan in the past. The recent attack at JIA Karachi is still fresh in memory. A precedent exists. So how did the Security around Peshawar AFB not get boosted up? Can this situation be replicated at or around other air-fields in Pakistan? This is the really worrisome part!
4. The statement "even a hand gun can penetrate the cabin" is simply an exaggeration. It cannot; not in case of an airliner in the air; but may do so only at an airplane stationary, at point-blank range.