Randy Jackson Time to Himself

9/2/2012 4:40 AM PDT

Randy Jackson -- Time to Himself

Suddenly finding himself with a lot of free time on his hands, Randy Jackson was spotted at LAX yesterday ... heading out of town.

As TMZ first reported, Randy will not be back as a judge on the next season of "American Idol," but will transition into a "mentor" role on the show.

As for who will be filling his seat ... Mariah Carey has signed on and Nicki Minaj and Keith Urban are thiiiis close to putting pen to paper. Adding a fourth judge is almost certain to happen as well.