Newark Liberty International Airport is an international airport within the city limits of both Newark and Elizabeth, New Jersey, in the United States. It is located about 15 miles southwest of Midtown Manhattan and 60 miles northeast of Philadelphia, serving both metropolitan areas. Newark Airport was the first major airport in the United States.

Newark Airport, along with JFK Airport and LaGuardia Airport, combine to create the largest airport system in the United States, the second largest in the world in terms of passenger traffic, and largest in the world in terms of total flight operations.

Newark Liberty Airport works as a hub for FedEx Express and United Airlines. In 2019, EWR Airport served 46,336,452 passengers. Newark Liberty Intercontinental Airport has 3 passenger terminals, with 3 concourses each one. Terminals A & B were originally built in 1973. Newark Airport was opened in 1928, being the first major airport in New York area and in the United States.

- London, Tel Aviv and Paris are the busiest international routes.

- Orlando, San Francisco and Los Angeles are the busiest domestic routes.

In 2017, EWR was the sixth busiest airport in the United States by international passenger traffic and fifteenth busiest airport in the country. It served 43,393,499 passengers in 2017, which made EWR the forty-third busiest airport in the world by passenger traffic. In 2019, the airport saw 46,336,452 passengers, the most in its history.

Newark serves 50 carriers and is the third-largest hub for United Airlines, the airport's largest tenant (operating in all three of Newark's terminals),and FedEx Express, its second-largest tenant (operating in three buildings on two million square feet of airport property). During the 12-month period ending in July 2014, over 68% of all passengers at the airport were carried by United Airlines.