The Story of Long Island MacArthur Airport: From Wartime Airfield to ISP

Long Island MacArthur Airport feels compact enough today that its beginnings are easy to underestimate. Walk through the terminal, and nothing announces that ISP started as a World War II project rather than a civilian gateway. That contrast is where the ISP history gets interesting.

What began as a military airfield in the 1940s became a regional passenger airport and picked up pieces of Long Island’s aerospace legacy along the way. Today, it sits at the center of an ambitious proposal involving the Long Island Rail Road. Those shifts help explain how a wartime airfield became the compact regional airport Long Islanders use today.

It Started With a War, Not a Vacation

In April 1942, the Town of Islip agreed with the federal government to build an airfield on town-owned land for military use. The Civil Aeronautics Administration, a predecessor of today’s FAA, funded three paved runways, and the field officially became active in May 1943.

At first, locals knew it simply as Islip Airport. Local official Charles H. Duryea suggested naming it for General Douglas MacArthur. His escape from the Philippines in 1942 had made him one of the most recognizable American military figures of the war.

Aviation companies arrived quickly. Lockheed Aircraft Corporation put up the first hangar in 1944, placing the field inside a much larger chapter of Long Island aviation history. During those years, military technology and aircraft manufacturing became deeply tied to the region.

The Airport Nearly Took a Different Path

After the war, events took a slightly odd turn. In 1947, Islip offered MacArthur Airport to the Port of New York Authority, the organization that eventually became today’s Port Authority of New York and New Jersey. The authority declined because the field fell outside its territory, so the Town of Islip kept it.

Two years later, the Town opened its first passenger terminal in anticipation of airline service. Aerospace work continued alongside it, and Sperry conducted research at the field during the 1950s. For a while, the field carried a technical identity more than a commercial one.

Passengers still had to wait. Scheduled commercial flights did not begin until 1960, when Allegheny Airlines launched service from Islip to Boston, Philadelphia, and Washington, D.C. With that first route map, MacArthur officially entered the passenger era.

The Terminal Grew One Piece at a Time

The terminal people recognize today did not appear all at once. The central portion opened in 1966 as the General Douglas MacArthur Terminal. A west concourse followed in 1989, and the east concourse opened in 2006 as passenger numbers grew.

Official feasibility documents describe the current building as the result of those additions rather than one single construction project. In other words, today’s building is the product of several decades of additions rather than one major build. MacArthur Airport terminal development has tended to follow demand rather than trying to turn ISP into a miniature JFK.

ISP Became a Different Kind of New York Airport

MacArthur never developed into another LaGuardia or JFK, and that is partly the point. ISP sits in Ronkonkoma, about 50 miles from Manhattan, and serves Nassau and Suffolk counties primarily while also drawing passengers from the wider metropolitan region. The FAA added ISP to the official New York metro airport group in 2011.

According to the Town, MacArthur now welcomes roughly 1.6 million commercial passengers annually and covers more than 1,300 acres with three runways and two helipads. Today, ISP has six airlines and 16 nonstop destinations, with JetBlue, Avelo, and Cape Air all arriving since 2024. About a decade ago, it had two airlines and six destinations.

For Long Islanders, that smaller scale became part of the appeal. An airport day at ISP involves no hour-long terminal transfer and no need to treat the building like a small city. If you’re flying through MacArthur Airport, that compact footprint is part of what makes ISP feel so distinctly Long Island.

The Next Chapter May Connect the Airport to the Train

The biggest current story isn’t another airline announcement, but the future of the terminal. In 2025, the Town of Islip announced it would seek private investment for a new or substantially redeveloped terminal with a direct connection to Ronkonkoma LIRR station. The concept could eventually give passengers a plane-to-train link toward Penn Station or Grand Central Madison.

The site remains open, with options including a site near Ronkonkoma station or redevelopment of the existing terminal area. New York State has already committed $150 million toward infrastructure connecting the rail station with a proposed North Terminal.

In July 2026, the Town named Fly Long Island, a joint venture of RXR and Avports, as its preferred developer. The Town Board still has to approve that choice, and it has already blocked the first round of funding. Any new building is still years away.

From Three Runways to Whatever Comes Next

The interesting part now is that MacArthur may be approaching another major change, yet its core character looks set to hold. A new terminal and rail connection could alter how people reach ISP and how it fits into the wider New York airport network, while its role as Long Island’s local commercial airport remains much the same.

That story is still happening close to home. For someone flying through ISP today, even the trip to the airport looks nothing like it did when MacArthur first opened. MacArthur has spent more than 80 years changing with Long Island, and the next version may simply make it easier to get there.