wsmalley,

I don't know about all modern fighters, but there are some that have used slats. Slats and flaps are frequently ( usually ) used together. Flaps give higher lift at a given angle of attack ( and actually, since the effective trailing edge of the wing moves downward as the flap is deployed, flap deployment increases the angle of attack ), and slats allow higher AoA to be used. Certainly, it is not either/or. The Skyray could not have flaps, since it had no tail. If I get a chance, I will cruise the web tomorrow to see which contemporary fighters use slats.

banktoturn