Crystal, 1 1/2 hrs would very stress inducing since it is just darn unlikely that you would have left the East coast on time or arrived here in LA at anything like the ETA! 3 hours would be just right if it was me. No worries when the plane is delayed on take off and no running thru the airport looking for your connection. Stretch your legs and get a Starbucks and a "I Love LA" t shirt. See ya on board!