https://upload.wikimedia.org/wikipedia/commons/9/97/Sa-7.jpg
Also with the SA-7 featured above the target must be silhouetted against bare sky for the seeker to "see" the target. So if I'm a hilltop rebel trying to fire on a helicopter approaching from low in a valley using the SA-7 Grail, then forget it, the missile sees nothing, since there is a mountain behind him.
But After Reagan's air attack against Khadaffi (much later it turned out his daughter was not killed in the raid, as he'd claimed for many years), Khadaffi imported newer Soviet AA missiles, also, like the SA-24 Grinch, below, and THIS is the real problem:
http://4.bp.blogspot.com/-j5TUVPrTpqA/Tmh48bS0bOI/AAAAAAAAAXM/T2e2iOPYRrw/s400/SA-24_Grinch_9K338_Igla-S_portable_air_defense_missile_system_Libya_Libyan_army_001.jpg
It flies at Mach 2, reaches up above 10,000 feet, and the aircraft needn't be seen against empty sky for targeting. Also the Grinch needn't score a physical hit for detonation --it also comes equipped with proximity fusing, so if senses an impending bypass, it will still trigger. Also if there is remaining fuel, this, too, will be blown in the explosion as a kicker. Even with jamming and flares, about one in four Grinches will score a hit, generally.
What type of success might it get against commercial aircraft in their current form...? The Obama Admin does NOT want to talk about this at all.