Why should it be left to governments and airlines with skin in the game to decide whether to issue flight restrictions or comply with warnings? What is needed is an international governing body charged with enforcing air corridor restrictions or closures, rather than merely issuing protocols and alerts.
Opponents of the Iran deal have been unable to produce a viable alternative. That is because there really are no alternatives left. Should the Iran deal collapse under the weight of spoilers like Schumer, Iran will get a nuclear weapon. And once Iran achieves and announces that capability to the world, no expert will be able to foresee the consequences.