Phoenix is a real location in south-western Arizona - it is the home city for Lambdatron, the R&D company that employs Jennlynn Swift, Tanisha Blythe and Jon Chladek. Lambdatron is actually situated in Tempe, a suburb southeast of Phoenix itself.
Sky Harbor Airport shows up frequently in the stories that involve Jennlynn. It is the main international airport for the area and is just east of downtown. She rents a hangar there for Skyhook and Songbird. One of the tenants at Sky Harbor is Hernando Aviation, run by Stewart Dozier. He does all of her aircraft repair and maintenance work (annual inspections, etc).
The Sky Harbor web site is here: http://skyharbor.com