Those weapons only win if you don't care about civilian losses (that is one way to win a counter insurgency, see Mandatory Palestine) - but by not caring about civilian casualties I mean you have to be willing to commit genocide (again, see the British actions in Mandatory Palestine).
If you do care about civilians (and I assume the US armed forces would be forced to care) a jet is probably not worth much against an AK-47, as long as that AK-47 is in the hands of a guy who is willing to hang out close to a bunch of civilians.
Again you can win a counter insurgency either by winning over the local population or by utterly destroying it (see manda, the Island of Melos).
If you do care about civilians (and I assume the US armed forces would be forced to care) a jet is probably not worth much against an AK-47, as long as that AK-47 is in the hands of a guy who is willing to hang out close to a bunch of civilians.
Again you can win a counter insurgency either by winning over the local population or by utterly destroying it (see manda, the Island of Melos).