Air combat between the remaining air factors is then resolved normally. If one side had two jets, he could either use the extra jet to increase his chances of victory in air combat against the opposing jet, or use it against the enemy air factors. As is the case with normal air units, jets may only attack once each game turn, and are inverted after doing so. Before normal air combat is resolved, the jet makes its attack. If this reduces the number of attacking air factors below the number of defending air factors, inversion of the defender's air factors is no longer automatic, and depends on the outcome of normal air combat between the surviving, undamaged attackers and the defenders.
Jets thus introduce an element of uncertainly into the opposing side's calculations.
The attacker counterairs a hex containing uninverted jets. Combat is optional. Otherwise one attacking air factor could force several jets to invert. Uninverted jets are unaffected by counterair attacks unless they choose to engage the attackers. The defender lose one air factor and one jet.