Israeli jets can attack Iran without overflying any third country. Look at a map of the region. This explains how it may happen.
IAF F-15 and F-16 fighter-bombers fly south from bases near Elat Airport in Southern-most Israel out the Gulf of Aqaba and straight down the middle of the Red Sea (1100 nm.) The Red Sea exits at the Gulf of Aden into the Arabian Sea where, over international waters, these planes are refueled by IAF tanker aircraft (yes, they have them), and then proceed northeast another 900 nm until they turn 90 degrees left, flying into Iran near the entrance to the Persian Gulf at the Straights of Hormuz. From there, it's a straight line to the nuclear reactor at Bushehr 300 nm northwest up the Iranian coast and on to other targets in Iran.
Approached from the Arabian Sea, IAF F-15s can strike anywhere within Iran, while the shorter-range F-16s can hit targets in the southern half of the country before they have to turn around and fly back out to meet circling Israeli Air Force air tankers, fill up again, before returning to bases in Israel.
Not an easy mission, but not outside the technical abilities of the Israelis. Everyone will feign surprise, particularly in Washington. Aside from Iran, no one can complain about encroachment into their airspace, and Iran will have a hard time justifying to the world any decision to attack U.S. or third country installations in the region on the basis that Israel received de facto overflight rights.
This makes it almost too tempting for Sharon to resist. Because we armed Israel with 600 bunker busters and a whole lot of other guided munitions (not to mention the aircraft to deliver them to targets in Iran), of course, Iran would blame the U.S. for all the Iranian citizens who are going to be killed by such an attack. Therefore, Iran may decide to launch its missiles and chemical and biological weapons at US targets in the region anyway.
Such an eventuality would likely signal a wider war with massive casualties.
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