My guess is that it went something like this: After we blew their general into a million pieces, they talk a lot of shit about how they're gonna destroy us. Then after mourning the general long enough, they decide to shoot a bunch of missiles at bases populated at least in part by American troops, but in doing so, actually only destroy a couple of tool sheds with those efforts. Us, expecting them to attack, are monitoring the situation, and when they do, we respond almost instantly using stealth and maybe other secret aircraft, proving that we already have air superiority over their airspace. Perhaps even buzzing their presidential palace or other important Iranian government facilities, just to prove that we can be up your ass in an instant without you knowing it. Then, after being freaked the fuck out by planes with USA painted on them almost giving them all free haircuts, they pop off a couple of SAMs at the next thing they see on the radar. Boom, down comes a passenger jet with almost 180 people on it.