The problem isn't the innate capabilities of one group of people or nation, it's a question of what they are fighting for. The Iraqis aren't running away because they are born cowards, they are running away because there's nothing worth dying for, and they have no confidence in their commanders, equipment, Government, etc. Wouldn't matter if you gave them F-22s and M1 Abrams.
So, if political tokenism dictates they get jets, give them something cheap and simple, easy to train for and maintain, which is optimised for the threat they have - the A-10.