It may depend on who is operating the air-defense surveillance system too. It is looking more and more like Mossad has penetrated Syria’s intelligence and armed forces.
Used to be air defense all over the USA. Old Nike sites are all around this town, and they are empty. Any air defense that is left is highly mobile and is for the single kamikaze attack such as terrorists might try. Even the ABM is intended only for a small ICBM attack such as Iran or N Kor might try, maybe ten warheads. The defense consists of the unstoppable retributive offensive capability that would blast any enemy and the top twenty feet of dirt of his home country to Mars after the cowardly sneak attack.
Were you a Thud Driver? There is a simpler analysis for this raid.
I wonder about that, too. To make the system completely broken down may need more than fancy countermeasures on F-15. What did Israeli do?