The Curtiss Jenny, the Ninety-Horse War-Surplus Trainer That Sold for the Price of a Used Car and Carried the Whole Barnstorming Era on Its Wings

The Curtiss JN-4 “Jenny” was a war-surplus military trainer that flooded the American market after World War I, selling for around $200 - about the price of a good used car. Powered by a modest 90-horsepower Curtiss OX-5 engine, this slow, forgiving biplane became the workhorse of the 1920s barnstorming era, giving hundreds of thousands of ordinary Americans their first-ever airplane ride and launching the careers of a generation of aviators, including Charles Lindbergh.

What Was the Curtiss Jenny?

The Jenny began life not as a daredevil’s machine but as a schoolteacher. In 1915, the Curtiss Aeroplane Company - run by Glenn Curtiss out of Hammondsport, New York - set out to build a training airplane for the U.S. Army.

Curtiss had already designed a Model J and a Model N. Engineers combined the best features of both, and the resulting aircraft was designated the “JN.” Say those letters quickly and casually, the way a tired mechanic might, and they blur into “Jenny.” The nickname wasn’t planned. It simply stuck.

By the time the United States entered World War I, the Jenny was the airplane most American military pilots learned to fly on. The version that mattered most - and the one that later flooded the civilian market - was the JN-4D.

How Powerful Was the Jenny’s Engine?

The JN-4D produced just 90 horsepower from its Curtiss OX-5 engine, a water-cooled V8 that was as unreliable as it was iconic. Many modern cars make more power than that.

The OX-5’s valve gear sat fully exposed on top of the engine, with rockers and springs flapping in the open air and flinging oil back at the pilot. It was notoriously temperamental - pilots joked that the engine had two states: about to quit, and already quit. Forced landings were routine, not emergencies.

Yet that very weakness is what made the Jenny perfect for what came next. Wide open and straight, she topped out around 75 mph. She stalled slowly and gently, floating into a pasture at roughly 40 mph and rolling to a stop in the length of a football field on grass. Built of wood, wire, and cotton fabric, a damaged Jenny could be patched back together in a barn with dope, glue, and wire.

Slow. Forgiving. Cheap to fix. Those three traits defined everything that followed.

Why Were Jennies So Cheap After the War?

The war ended in November 1918, leaving the U.S. government sitting on a mountain of military aircraft it no longer needed - thousands of Jennies, many brand-new and still crated in cosmoline and pine boxes, alongside warehouses full of spare OX-5 engines.

The government wanted them gone, and sold them for pennies on the dollar. In the early 1920s, a crated, factory-fresh Curtiss Jenny could be purchased for around $200. Some buyers paid a little more, some less, and some bought them by the lot to sell for parts.

The math was staggering: a brand-new automobile cost more than the airplane. For a young war-trained pilot facing a quiet life behind a hardware-store counter, an airplane he could buy for $200 was an irresistible alternative.

What Was Barnstorming?

Thousands of those young pilots bought Jennies and went barnstorming. The term was borrowed from traveling theater troupes and stump politicians who “stormed” from town to town, sometimes literally performing in barns.

The routine repeated itself thousands of times across the country in the 1920s. A pilot would come in low over a town, cut the engine, and dive slightly to make the bracing wires moan - an eerie sound that turned every head on the ground. He’d buzz Main Street, then land in the biggest flat pasture near town.

Then he waited. In an era when most people had never seen an airplane on the ground, the entire county came running. That crowd was the customer base.

How Did Barnstormers Make Money?

The business model was simple. A pilot would cut in the farmer who owned the field - a few dollars or a free ride in exchange for the use of the pasture - and then sell rides to the crowd.

A dollar a minute was common. Five dollars bought a real hop over the town and back. For many rural Americans, it was the biggest and best five dollars they ever spent. Grandmothers, farmers, and wide-eyed children climbed into the front cockpit and came down changed, having seen their own town laid out below them for the first time.

What barnstormers were really selling wasn’t a ride. It was the idea that ordinary people could fly.

What Were the Barnstorming Stunts?

As crowds grew harder to impress, pilots added spectacle - and this is where the era earned its legend:

Wing walking - men and women standing upright on the top wing in a 70-mph slipstream
Plane-to-plane transfers and car-to-plane transfers via rope ladder from a speeding automobile
Parachute jumps, back when a parachute was still an experimental novelty
Mock dogfights, streamers, and wingtip fireworks at night

The airplane holding steady beneath all that chaos was almost always the Jenny. Her slow, honest flight made stunts possible - a faster, twitchier aircraft would have thrown a wing walker clear off. The Jenny simply plodded along at 70 mph, patient as a plow horse.

It was also desperately dangerous. In the early 1920s there were no rules: no pilot license, no aircraft inspection, no medical requirement, no minimum altitude. A person could buy a Jenny on Monday, teach himself to fly by Wednesday, and carry paying passengers by the weekend. Many did - and many died from engine failures, stalls, and falls.

Why Did the Barnstorming Era End?

In a bittersweet twist, the barnstormers ended their own era by succeeding at it. By giving America its first taste of flight, they created public demand for aviation to become a serious, reliable industry - mail, passengers, and business.

The government, looking out at a sky full of $200 Jennies flown by self-taught daredevils, concluded that aviation had to be made safe to grow. In 1926, Congress passed the Air Commerce Act.

Suddenly there were rules. Pilots had to be licensed. Aircraft had to be inspected and certified airworthy. Minimum altitudes over towns were established. Buzzing Main Street at fifty feet with the engine cut was no longer legal.

Many tired, repeatedly patched Jennies simply couldn’t pass certification. They were declared unairworthy and grounded - retired, burned, or left to rot behind barns. By the end of the 1920s, with engines worn out, surplus stock exhausted, and better aircraft available, the great fleet of Jennies faded from the sky it had opened.

Why the Jenny Still Matters

A large share of the golden age’s biggest names - record-setters, airline founders, and test pilots - started out broke and young in the front seat of a Jenny, selling five-dollar rides in a pasture. Charles Lindbergh barnstormed a Jenny before his 1927 flight to Paris. Thousands of other pilots, whose names history never recorded, did the same just as bravely.

That homely, 90-horsepower trainer was the schoolhouse of American aviation. More than any fighter plane that came after it, the Curtiss Jenny is the reason a whole generation of Americans first looked up at the sky and imagined themselves in it.

Key Takeaways

The Curtiss JN-4 “Jenny” was a WWI-era military trainer designed by Glenn Curtiss in 1915, built by combining the Curtiss Model J and Model N.
Powered by a 90-horsepower OX-5 V8 engine, it was slow (about 75 mph top speed) and unreliable - but forgiving, cheap, and easy to repair.
After the war, surplus Jennies sold for around $200 each in the early 1920s, less than the cost of a new car, fueling the barnstorming boom.
Barnstormers sold rides for about a dollar a minute and performed wing walking and aerial stunts, giving countless Americans their first flight.
The 1926 Air Commerce Act introduced licensing and airworthiness rules that grounded many Jennies and effectively ended the barnstorming era.