All,
1991: Gulf War.
Somehow, Bush managed to keep Israel out of it - stroke of genius really.
But .. what if he had failed?
This is focused on two areas, not the fall-out of Israel getting into it in itself:
1) What would Israel bomb? The coalition did a reasonable good job after all
2) Without being in on the ATO there is a good chance that they could get shot down or cause mid-air collisions
In essence, the air-space was packed and having people to just fly around would cause havoc. General Horner's book has a couple of those incidents (Marine pilots, if my memory serves me well).
Ivan