The FAA has announced that LPV (Localizer Performance with Vertical navigation) approaches now outnumber ILS approaches at airports around the United States. What does that mean to you...well with vertical navigation on the approach, it allows aircraft to descend to a lower altitude than on other type of approached, in most cases. The approach does decrease the size of the trapezoid protected, thus leaving more area to construct off approach ends of runways. The big problem right now is that VOR or ADF approaches still serve the same runways, multiple approaches to the same runway, thus in effect not really opening up more "acreage" to build. This is still a complex business and an accurate study is now more important than ever.
There are 1,333 LPV approaches now in service at 833 airports. The FAA is committed to publish 500 additional approoaches each year until all qualified runways are served.