Sky Harbor International Airport is the main airport for the city of Phoenix, located in south-western Arizona. The airport is just east of downtown and shows up frequently in the stories that involve Jennlynn Swift or Lambdatron. She rents a hangar there for Skyhook and Songbird. One of the other 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