The Presidential Decision Directive (PDD) on the Global Positioning System (GPS) recommends that Selective Availability (SA) be removed by 2006. The question remains: if SA were to be turned off, how significant are the benefits to the GPS community? This paper examines the benefits of removing SA as it relates to airborne GPS integrity and demonstrates that there are substantial improvements in the availability of GPS integrity. The study evaluates the current TSO C-129 Receiver Autonomous Integrity Monitoring (RAIM) algorithm, which provides fault detection for supplemental use of GPS. Fault detection and exclusion (FDE) functionality for primary means navigation will be contained in the Wide Area Augmentation System (WAAS) equipment (TSO C145/C146), but is designed to be used independent of WAAS. The availability of GPS integrity is examined globally and the results are compared to RAIM and FDE availability with SA on the system. Other augmentations to improve availability, such as ..