TRAVELPlanespotting at San Francisco International AirportA United Airlines Boeing 747 takes off for Hong Kong from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYVirgin America tails group together at Terminal Two at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYAn Emirates Airbus A380, flying in a special Los Angeles Dodgers livery, departs for Dubai from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYAn Air France Airbus A380 begins the long journey to Paris from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYAn Air China Boeing 747-8i lands at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA WOW Air Airbus A330 arriving from Iceland lands at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA Lufthansa Airbus A380 departs from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA United Airlines ramp worker guides a departing United Boeing 747 out for departure from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYWings flexing, a United Airlines Boeing 787 takes off from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYUnited Airlines Boeing 757s trade places at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren / SpecialA tiny United Express CRJ regional jet is dwarfed by the massive the Emirates Airbus A380 taxiing behind it at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA United Airlines Boeing 747-400 arriving from Frankfurt, Germany, lands at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYSingapore Airlines' first nonstop flight connecting Singapore and San Francisco taxis to the gate at San Francisco International Airport after arrival on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYJets line up for departure during the early evening rush at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA British Airways Boeing 777 takes off from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA U.S. Coast Guard helicopter prepares to land at its base at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA United Airlines Boeing 757 taxies to the gate after arrival at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren / SpecialA Japan Airlines (JAL) Boeing 777 leads the way through a heavy crosswind while a British Airways Airbus A380 follows behind for landing at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA Japan Airlines Boeing 777 arriving from Tokyo lands at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA Delta Air Lines Boeing 757 takes off from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA United Express CRJ regional jet lands at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA Delta Air Lines Boeing 737-800 lands at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYAn Air China Boeing 777 arriving from Beijing prepares to land at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA Virgin Atlantic Boeing 787-9 takes off for London from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYAn Air Berlin Airbus A330 arrives to San Francisco International Airport from Germany on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYAn Air Berlin Airbus A330 departs San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYAs night falls, a United Airlines Airbus A319 prepares for departure from San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYJets line up for departure during the early evening rush at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA United Airlines Airbus A319 waits to cross the runway at San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA China Southern Boeing 787 Dreamliner taxiies to a gate after arriving to San Francisco International Airport on Oct. 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYA United Airlines Boeing 777 taxies out for departure on an early morning at San Francisco International Airport on April 23, 2016.Jeremy Dwyer-Lindgren, Special For USA TODAYAn entrance to San Francisco International Airport (SFO) is seen on July 1, 2016.EPAA Virgin America plane lands within view of a United Airlines plane at San Francisco International Airport on Feb. 18, 2015.Justin Sullivan, Getty ImagesA sign is posted near the departures monitor for the new Yoga Room at San Francisco International Airport's terminal 2 on Jan. 26, 2012.Justin Sullivan, Getty ImagesTerminal 2 is seen through the window of a sky train station at San Francisco International Airport on March 13, 2015.Justin Sullivan, Getty ImagesA United Airlines Boeing 747 sits on the tarmac at San Francisco International Airport on June 10, 2015.Justin Sullivan, Getty ImagesA Lufthansa Airbus A380 plane lands at San Francisco International Airport on May 10, 2011.Justin Sullivan, Getty ImagesAn American Airlines aircraft passes in view of an American Airlines gate at San Francisco International Airport's "T2" Terminal 2 on April 6, 2011.Ben Mutzabaugh, USA TODAYThe Virgin Galactic spaceship sits on the runway at the new T2 Virgin terminal at San Francisco International Airport on April 6, 2011.Martin E. Klimek, For USA TODAYFliers enter the San Francisco's new "T3E" gates under this modern-looking entrance area.Ben Mutzabaugh, USA TODAY