The U.S. Airlines With the Oldest and Newest Fleets [2026 Study]

Ticket price, flight times, and seat comfort can all shape which flight travelers book. But there’s another detail many passengers care about, even if they rarely check it: the age of the airplane they’re flying on.

To find out which airlines operate the oldest and newest fleets, we analyzed fleet data for 9 major U.S. airlines. We compared average aircraft fleet ages by airline, identified each airline’s oldest plane, and measured how much of each airline’s fleet has flown for at least 25 years.

We then surveyed 1,010 U.S. air travelers to see how airline fleet ages compare with passenger expectations and whether an aircraft’s age would influence booking decisions. Read on to see which fleets are younger than travelers assume, and how much passengers would pay to fly on a newer plane.

Which Airlines Have the Newest and Oldest Fleets?

Average fleet age by airline, ranked youngest to oldest:

• Frontier Airlines — 4.8 years old
• Alaska Airlines — 9.5 years old
• Southwest Airlines — 11.0 years old
• JetBlue — 12.4 years old
• Allegiant Air — 14.1 years old
• American Airlines — 14.8 years old
• Delta Air Lines — 15.0 years old
• United Airlines — 15.0 years old
• Hawaiian Airlines — 15.0 years old

Oldest individual aircraft by airline:

• Frontier Airlines — 11.0 years old
• Southwest Airlines — 24.0 years old
• JetBlue — 26.8 years old
• Allegiant Air — 26.9 years old
• Alaska Airlines — 27.2 years old
• Hawaiian Airlines — 27.9 years old
• American Airlines — 28.8 years old
• United Airlines — 35.5 years old
• Delta Air Lines — 37.4 years old

Travelers may be picturing older planes than airlines actually operate. Survey respondents believe the average U.S. passenger plane is about 20 years old, but the average fleet age is actually 12.4 years old across the 9 largest U.S. airlines analyzed in the study. The difference suggests passengers tend to overestimate the age of planes in service.

The biggest surprises come from Delta and Frontier. Delta is the airline travelers most often associate with the youngest fleet, yet its average fleet age of 15.0 years ties with United and Hawaiian for the oldest in the study. Delta also operates the oldest individual aircraft, at 37.4 years old. Frontier faces almost the opposite perception. It is the second-most common choice for the airline with the oldest fleet, but its aircraft average just 4.8 years old, making it the youngest fleet in the study. Even Frontier’s oldest plane is only 11 years old.

Southwest also stands out, with the youngest fleet among the Big 4 U.S. airlines: American, Delta, United, and Southwest. Its average fleet age of 11 years puts it ahead of American’s 14.8 years and Delta and United’s 15.0 years. For travelers comparing those carriers, fleet age offers another detail to consider alongside the price, schedule, and onboard experience.

The Airlines With the Largest Share of Aircraft 25 Years or Older

The percentage of aircraft that are 25+ years old by airline:

• United Airlines — 30.7%
• Delta Air Lines — 27.6%
• American Airlines — 24.3%
• Hawaiian Airlines — 15.3%
• JetBlue — 5.7%
• Allegiant Air — 4.8%
• Alaska Airlines — 3.7%
• Frontier Airlines — 0.0%
• Southwest Airlines — 0.0%

A fleet’s average age tells only part of the story. Looking at the share of aircraft age 25 or older shows which airlines have a larger concentration of planes with decades of service behind them. United leads at 30.7%, followed by Delta at 27.6%. American comes next at 24.3%, making older aircraft a sizable part of each of these carriers’ fleets.

Planes that have reached the 30-year mark are much less common. Only United and Delta operate aircraft aged 30 or older among the U.S. airlines analyzed, accounting for 4.9% and 3.6% of their respective fleets. While both carriers have individual planes well into their 30s, those aircraft represent a small share of their overall fleets.

Southwest and Frontier sit at the other end of the spectrum. Despite operating 798 aircraft, Southwest has no aircraft aged 25 years or older, reinforcing its position as the youngest fleet among the Big 4.

Frontier also has no planes in that age group, and almost 25% of its fleet is younger than 2 years old. The airline itself is relatively young, having been founded 32 years ago, making it younger than some of the oldest aircraft still operated by Delta and United, both of which have been in business for roughly a century. Together, these findings show how differently airlines’ fleets can be distributed, even when travelers are comparing familiar names in the same flight search.

Do Travelers Care About Aircraft Age? Yes.

Aircraft age may not be the first detail travelers consider when searching for flights, but many say it matters. More than half of respondents, 57%, care about the age of the plane they fly on. And when choosing between 2 similar flights, 63% say aircraft age would influence their booking decision. For passengers weighing otherwise comparable options, a newer plane could help tip the balance.

Travelers also want that information to be easier to find. According to the survey, 71% want airlines to disclose aircraft age when booking. Many say they would spend more for a newer plane, too: 64% would pay extra, with $26 to $50 the most popular additional amount. That suggests aircraft age has value for many passengers, even if the premium they would accept has limits.

Still, interest does not always translate into action. While travelers say aircraft age matters, 91% have never looked up the age of their plane before flying. For many, that appears to be a matter of know-how rather than indifference: most passengers say they would not know where to find that information.

Aircraft age alone does not determine whether a commercial plane is safe. U.S. commercial airlines must comply with federal aging-aircraft inspection and records-review requirements. Still, safety is the concern travelers most associate with older planes, cited by 78.8% of respondents. That is well ahead of seat comfort or condition at 50%, limited Wi‑Fi, charging ports, or power outlets at 33%, and cabin cleanliness at 28.5%.

How To Check the Plane and Seat Configuration Before You Fly

An airline’s average fleet age is a helpful starting point for comparing carriers, while the planned aircraft can offer a closer look at the experience on a specific flight.

Once you have narrowed down your flight options, checking the planned aircraft can reveal more practical details about the onboard experience. Before booking, expand a flight’s details in Google Flights to see its planned aircraft type. To compare seat layouts, log in to ExpertFlyer, select “Seat Map,” and enter the departure and arrival airports, travel date, airline, flight number, and cabin. The resulting map can help travelers identify differences in seat types, layouts, and available amenities. That extra context can be especially helpful when comparing otherwise similar flights.

Methodology

This study combines fleet data analysis with a survey of U.S. air travelers. For the data portion, we analyzed the current fleets of the 9 largest U.S. airlines using fleet data from Planespotters.net, accessed in September 2026. For each airline, we recorded its total active fleet, average fleet age, and the age of its oldest aircraft. We then counted the planes younger than 2 years old and those aged 25 or older and 30 or older. Each count was divided by the airline’s total current fleet to calculate the corresponding fleet share.

For the survey portion, we launched a national survey of 1,010 U.S. air travelers in September 2026. The findings show where traveler perceptions align with the actual fleet data and which airline fleets may be older or newer than passengers assume. Supplemental survey findings show whether passengers care about aircraft age and whether that age would impact comfort, trust, or booking decisions.

Final Thoughts

While many respondents said an aircraft’s age was important to them, airlines aren’t overly clear about that information — though the respondents wish they were. Respondents in our survey discussed which airlines they thought had the oldest and newest plane fleets, but their estimations and the real data showed some stark differences in which airlines had the youngest fleets and which had the oldest planes.

Fair Use
You are welcome to use, reference, and share non-commercial excerpts of this study with proper attribution. If you cite or cover our findings, please link back to this page so readers can view the full methodology, charts, and context.