WAAS provides a Localizer Performance with Vertical Guidance (LPV) approach landing capability at over 1690 airports in the United States. The purpose of this paper is to show the WAAS LPV availability for all Conterminous United States (CONUS) and Alaska airports with defined LPV approaches, and to examine, analyze and characterize the types of events that affect availability of service. Two years of data analyzed month by month will show how ionosphere activity, weakness in the GPS constellation, switching uplink stations and other specific WAAS events affect the availability and continuity at various airports. The paper includes a discussion of various upgrades that have been implemented in the WAAS system over the years, specifically focusing on the optimized Kriging parameters, chi-squared thresholds, and other tuning that was implemented to maximize availability during the solar maximum. Analysis of the data shows outstanding performance with LPV service available 99.99% of the time at over 1361 airports and uninterrupted service (100% availability) at 929 airports.