Aircraft Boneyards: Where Do Old Airplanes Go to Retire?

The choice of location for a boneyard is a strategic business decision based on geology and meteorology. Most major facilities, such as the 309th Aerospace Maintenance and Regeneration Group (AMARG) in Tucson, Arizona, are located in the American Southwest for two primary reasons:

• Low Humidity: Moisture is the primary enemy of airframes and sensitive electronics. In the desert, humidity levels often hover in the low double digits, which naturally inhibits rust and corrosion [1].
• Hard Alkaline Soil: The desert floor—specifically the “caliche” soil found in Arizona—is so hard that it can support the immense weight of widebody jets without the need for expensive paved runways [3].

An aircraft’s retirement is governed by strict aircraft certification and airworthiness requirements. Depending on the airline’s needs and the state of the market, a plane enters one of several categories upon arrival.

1. Short-Term Storage (Parking)

Airlines often “park” aircraft during economic downturns or seasonal lulls. During the COVID-19 pandemic, facilities like Pinal Airpark saw an influx of planes where they were kept in “active” storage, receiving regular maintenance to ensure they could return to the skies within days.

2. Long-Term Preservation

If a plane is expected to sit for years, it undergoes “pickling.” Technicians drain fluids and replace them with preservative oils. Windows and doors are sealed with a white, reflective vinyl coating called “Spraylat” to keep the interior up to 15 degrees cooler and protect the cabin from UV damage [4].

3. Parts Reclamation (Harvesting)

This is the most lucrative phase. A retired Boeing 777 has approximately 3 million parts. Engines are the first to be removed, as they are often worth millions on the secondary market. Other high-value items include the landing gear, avionics, and even the aircraft nacelles, which can be refurbished and sold as spare units. According to data from The U.S. Department of War, the AMARG facility reclaimed 10,000 parts in a single year, saving the government an estimated $500 million [4].

4. Regeneration and Conversion

Some “retired” aircraft find second acts. Passenger jets are frequently converted into freighters for companies like DHL or Amazon. Others are regenerated for government use, such as the B-57 Canberra bombers used by NASA for high-altitude research [4]. On a larger scale, military operations often rely on the logistical prowess of retired assets, much like how aircraft carriers support global air operations by acting as mobile bases for both active and experimental fleets.

5. Scrapping and Recycling

Once an aircraft is stripped of all valuable components, the remaining “hulk” (mostly aluminum alloy) is shredded. Projections from the Aircraft Fleet Recycling Association suggest that modern recycling techniques can now reclaim up to 90% of an aircraft’s weight, preventing vast amounts of metal from ending up in landfills [5].

While Arizona is the “world capital” of boneyards, other global hubs have emerged to serve regional markets:

• Pinal Airpark (Marana, AZ): The world’s largest commercial storage facility [2].

• Teruel Airport (Spain): Europe’s primary storage site, designed to hold up to 250 large aircraft [3].

• Alice Springs (Australia): An arid location serving Asia-Pacific carriers like Qantas and Cathay Pacific [3].

• Roswell Air Center (New Mexico): A former Air Force base now hosting hundreds of retired widebody jets [1].

• Boneyards as Warehouses: They are not final graveyards but active warehouses for parts that keep current fleets flying safely.
• Climate is King: Dry, desert environments are essential to prevent corrosion and maintain the value of multi-million dollar components.
• Economic Drivers: Most planes are retired not because they are broken, but because newer models offer better fuel efficiency and lower maintenance costs.
• Sustainability: Recycling efforts now reclaim 90% of the metal from retired planes, fueling a circular economy in aviation.

Action Plan for Enthusiasts and Professionals

1. Visit Legally: Most boneyards are restricted military or private property. If you want to see retired aircraft, visit the Pima Air & Space Museum in Tucson, which offers bus tours of parts of the AMARG facility.
2. Buy a Piece of History: Companies like PlaneTags salvage the aluminum “skin” of famous aircraft and turn them into collectibles [5].
3. Monitor Industry Trends: If you are in aviation logistics, monitor the retirement schedules of major carriers, as this dictates the availability of “Used Serviceable Material” (USM) for maintenance.

The aircraft boneyard is a crucial, if often overlooked, gear in the engine of global aviation. By reclaiming parts and recycling materials, these desert outposts ensure that while a specific plane may stop flying, its legacy continues to support the passengers and pilots of the future.