Planner in DC might order that, but I doubt the pilots would comply with those orders. Posse Comitatis prevents US military from operating domestically and the officers know this.
Posse Comitatis prevents US military from operating domestically as a police force only. There is nothing to prevent the US Military from being used as a military force inside the US. In fact, the Oath of Enlistment says that as a member of the US Military you will defend the Constitution of the US from enemies both foreign and domestic. Officers and enlisted will follow their own personal politics as to whether they will carry out any orders to fire on the US population.
The officers also know that the moment they fire upon US citizens, their own homes and families become at risk.