What if the Hi-jackers are ex Mil Aircrew?
They could jettison the obese children of the passengers as decoy for any SA missles deployed and or jettison of the Hot Towels and inedible Hot meals to take care of the IR threat.
...............and you bolder lot can forget going for the gun solution as we all know a well flown B737 can out ACM a F3 Tonka, besides the crew would probably get lost in the urban jungle anyway:
