An F-16 flying from Israel to Iran in a straight line would need at least two refuelings. One in each direction. This would necessitate transiting Saudi airspace. The Saudis would ordinarily contest this passage unless it was arranged in advance. Either way, allowing the IAF safe passage in both directions would be an act of war by the Saudis. Naturally, Israel would love to see a war between Iran and Saudi Arabia and the Saudis know this. For this reason the Saudis would not grant safe passage. Even if the IAF managed to pass undetected on the way to Iran, the Saudis would be waiting to meet them on the way back. The IAF would be low on fuel and armaments in this situation. The IAF tanker planes become extremely critical. Without at least two refuelings, not a single IAF airplane would return to Israel. The IAF is not experienced in midair refueling, especially at night. Other scenarios all have their own hazards, making the mission risky on an epic scale. Israel will never have taken such a risk in it's existance. On top of this, the targets are by no means undefended or easy to knock out. Even if the attack were to succeed to maximum effect, Israel's own experts estimate that it will not delay Iran's project by more than a year and likely much less. I really don't think that netanyahu would take such a mad risk, which, at a minimum witll make the gasoline buying public outraged with Israrel and will invite Iran to launch a missile barrage on Israel. No way. It is a bluff. If it is not, then we better worry about Israel making a nuclear first strike. That's how mad the Israeli government would be to make such an attack.
Militants in Sinai shell house, killing family of five, say Egyptian officials (AP)
from the article: Feet on the ground, head in the sky