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LAAS (Local Area Augmentation System) is a ground-based GPS augmentation system, intended to be placed at airports to get position accuracy down to around 3m (~10ft) from WAAS's 10m.

I've read that it has been installed at a few airports, but can't track them down; I've also heard, anecdotally, that installation has ceased as WAAS is more than sufficient.

Is LAAS still being installed, and if so, where can one fly a LAAS approach?

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The Local Area Augmentation System was the FAA term for the Ground Based Augmentation System (GBAS), which is an International Civil Aviation Organization (ICAO) standardized system for local area differential systems.

The FAA has migrated to the ICAO term GBAS, though Several historical FAA documents still retain the LAAS terminology.

According to the FAA GBAS FAQ page,

Currently, two U.S. locations have obtained operational approval for public GBAS use and support revenue airline traffic. These stations are located at Newark Liberty International Airport (EWR) and Houston George Bush Intercontinental Airport (IAH).

According to FAA, development of GBAS continues and,

The FAA and other States are in the process of validating proposed ICAO GBAS standards to support Category III (CAT-III) precision approach operations. The FAA expects ICAO will approve GAST-D Standards and Recommended Practices in 2015

Also,

The FAA continues to validate the GBAS CAT-III requirements as part of the Next Generation Air Transportation System (commonly known as NextGen). The FAA has currently deferred any Federal acquisition decision on GBAS.

Also, though GBAS and WAAS are mutually exclusive at present, some future aircraft like A350 are expected to support both GBAS and WAAS.

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    $\begingroup$ You might want to add that the FAA's abbreviation for GBAS approaches is GLS (cf. ILS) and that's what you see on approach plates for the two airports you mentioned. $\endgroup$ – Pondlife Sep 28 '15 at 20:16

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