13,123 feet - less than the 13,800 recorded by the FAA. Seems unlikely that impact would occur at the tip of the range.
Correct. A missile with a heavier warhead might have it reduced to stretch some additional range/altitude, not likely with a Stinger or RBS-70. But a developmental or upgraded version might manage, and *golden BBs* do happen. A terrorist launch team would presumably be under orders to shoot a more certain target, a sitting duck- unless there was a target of mandatory importance on that particular flight.