Definition
LOCAL AIRPORT ADVISORY (LAA)
A service available only in Alaska and provided by facilities that are located on the landing airport, have a discrete ground-to-air communication frequency or the tower frequency when the tower is closed, automated weather reporting with voice broadcasting, and a continuous ASOS/AWOS data display, other continuous direct reading instruments, or manual observations available to the specialist.
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).