The airspace over the City of Tempe is used by airlines to depart and approach the Phoenix Sky Harbor International Airport.
The implementation of RNAV/RNP (Area Navigation/Required Navigation Performance) arrival routes at the airport made improvements to airline navigation accuracy and fuel burn, but also enabled improved flow of incoming aircraft that end in two parallel arrival paths over North Tempe.
The RNAV/RNP routes are shown on the map above when the runway traffic flows towards the west. The narrow flight paths stop at the point where the airlines are entering the final phase of the descent to prepare for final approaches to land at Phoenix Sky Harbor International Airport.
On September 18, 2014 the FAA turned on new PHX RNAV (Area Navigation) departure routing at Phoenix Sky Harbor International Airport.
The depiction above shows east flow departures on September 9, 2014.
This depiction shows east flow departures on September 18, 2014. The number of departure routes from Phoenix Sky Harbor International Airport were expanded from seven to nine.
Not all aircraft are able to use the RNAV or GPS based instrument flight procedures. At Phoenix Sky Harbor International Airport some classic departure routes over ground-based navigation aids are retained.
Click here to read about fligth procedure development.