" But the return trip home would also have to overfly enemies."
They can get there through Jordan and Iraq. Iraqi airspace is currently controlled by Americans and an arrangement would be possible there. Jordan would be a possibility too, in my opinion.
Finally someone said it.
An Israeli attack on Iran can't happen without the US making Iraqi airspace available.
Allowing such usage would be a very loud declaration that the US is on Israels side.
Since we're trying very hard to pretend that peace is possible between Israel and their muslim neighbors
we'll not take sides and we'll not give Israel that permission.
We need to take out Iran ourselves, but I don't see us having the will to do so anymore.
Standard Disclaimer: If I really knew I'd not be talking.