what airlines hub in phoenix?
Phoenix Sky Harbor International Airport
entailment
 Phoenix is served by Phoenix Sky Harbor International Airport ( IATA : PHX , ICAO : KPHX ) , one of the ten busiest airports in the United States , serving over 110 @,@ 000 people on over 1000 flights per day . The airport is centrally located in the metro area near several major freeway interchanges east of downtown Phoenix . The airport serves more than 100 cities with non @-@ stop flights . 

entailment
 Though located 13 miles ( 21 km ) south of downtown in unincorporated San Mateo County , San Francisco International Airport ( SFO ) is under the jurisdiction of the City and County of San Francisco . SFO is a hub for United Airlines and Virgin America . SFO is a major international gateway to Asia and Europe , with the largest international terminal in North America . In 2011 , SFO was the 8th busiest airport in the U.S. and 22nd busiest in the world , handling over 40 @.@ 9 million passengers . 

entailment
 Phoenix is currently home to four Fortune 500 companies : electronics corporation Avnet , mining company Freeport @-@ McMoRan , retailer PetSmart , and waste hauler Republic Services . Honeywell 's Aerospace division is headquartered in Phoenix , and the valley hosts many of their avionics and mechanical facilities . Intel has one of their largest sites in the area , employing about 12 @,@ 000 employees , the second largest Intel location in the country . The city is also home to : the headquarters of U @-@ HAUL International ; Best Western ; and Apollo Group , parent of the University of Phoenix . US Air / American Airlines is the largest carrier at Sky Harbor International Airport in Phoenix . Mesa Air Group , a regional airline group , is headquartered in Phoenix . 

neutral
 In August 1919 , Hounslow Heath Aerodrome , in London , England was the first airport to operate scheduled international commercial services . It was closed and supplanted by Croydon Airport in March 1920 . In the United States , Bisbee @-@ Douglas International Airport in Arizona became the first international airport of the Americas in 1928 . 

contradiction
 In 1978 JAL started flights to São Paulo and Rio de Janeiro via Anchorage and San Juan ; the stopover was changed to Los Angeles in 1982 and to New York 's John F. Kennedy International Airport in 1999 . Until 2009 the airline operated fifth @-@ freedom flights between New York and São Paulo and between Vancouver and Mexico City . 
