City pair City pair In commercial aviation, a city pair is defined as a pair of departure (origin) and arrival (destination) airport codes on a flight itinerary. A given city pair may be a single non-stop flight segment, a direct flight with one or more stops, or an itinerary with connecting flights (multiple segments). The city pair, IAD-LHR would consist of flights and/or multi-leg itineraries that originate at Washington-Dulles airport and terminate at London-Heathrow airport. The city pair, NYC-TYO would consist of flights and/or multi-leg itineraries that originate at any New York airport (New York-JFK, Newark-Liberty or New York-LaGuardia) and terminate at
Avery Dulles and Janet Pomeroy Avery Dulles. His uncle was Director of Central Intelligence Allen Welsh Dulles. Both his great-grandfather John W. Foster and great-uncle Robert Lansing also served as U.S. Secretary of State. His paternal grandfather, Allen Macy Dulles, was a member of the faculty of Auburn Theological Seminary and published in the field of ecclesiology, to which the Catholic Dulles would likewise devote scholarly attention. He received his primary school education in New York City at the St. Bernard's School and attended secondary schools in Switzerland and The Choate School (now Choate Rosemary Hall) in Wallingford, Connecticut. He then enrolled