Which have a top range of about 4800 feet. They are designed to hit ground attack aircraft and helicopters
If they are going to write stupid conspiracy theories, these wack job authors need to actually base it in fact. There are no weapon being supplied to the Syrians that can reach an airliner at 30,000 feet.
Wasting time on this sort of nonsense merely discredits everyone else who points out real wrong doing by the US government.
That’s about 4800 meters, so slightly above 15,000 feet.
Some variants have a range well over 20,000'.
Airliners can't stay in the air forever. They have to climb to cruising altitude and then descend back down.
For the sake of argument, let's allow for climb or descent rate of 2,000 FPM (Feet Per Minute), and airspeed of 250 MPH (aircraft will cover 4 miles every minute).
This allows a mobile terrorist equipped with one of these newer variants, to check with some web-based flight tracking system like maybe https://flightaware.com/, jump in his car and travel (10 minutes) to a point which intersects the aircraft's flightpath, up to 40 miles from the airport. Btw, the faster the aircraft's airspeed, the further from the airport the attack can take place.
The terrorist then exits the vehicle, acquires and brings down the airliner which would then be 10 minutes out and passing through 20,000' - a relatively slow moving non-evading target for a missile designed to strike a target traveling in excess of 800 mph in some cases.
According to https://en.wikipedia.org/wiki/FIM-92_Stinger, 70,000 missiles have been produced.
Theoretically, it could mean the end of "safe" air travel anywhere in the world as we currently enjoy it.
Wasting time on this sort of nonsense merely discredits everyone else who points out real wrong doing by the US government.
Sorry for wasting more of your time Johnie.