The Question Mark, the Fokker That Stayed Up for a Hundred and Fifty Hours Over Los Angeles, and the Army Fliers Who Invented Aerial Refueling One Dangling Hose at a Time

In the first week of January 1929, a three-engine Army Fokker named the Question Mark stayed in the air for 150 hours and 40 minutes - more than six days - circling over the Los Angeles basin without ever landing. It survived on fuel passed down by hand from other aircraft in flight, 43 separate times, day and night. The flight is remembered less as a record than as the experiment that proved aerial refueling was real, practical, and repeatable.

What Was the Question Mark Flight?

The Question Mark was a Fokker C-2A, a high-wing monoplane with a thick wooden wing and three air-cooled Wright Whirlwind engines - one in the nose and one on each side. That engine was already famous: a single Wright Whirlwind had carried Charles Lindbergh across the Atlantic two years earlier, in 1927. The Question Mark had three, and it would run them nearly continuously for the better part of a week.

The United States Army Air Corps of the late 1920s was small, underfunded, and eager to prove that the airplane had a future beyond carrying mail and thrilling county-fair crowds. One way to prove it was endurance. If an aircraft could stay aloft for days instead of hours, you could start talking seriously about long-range bombers and transcontinental flight.

The obstacle was fuel. Fill the tanks to the brim and the airplane is too heavy to leave the ground; take off light and you are back on the ramp in a few hours. So the crew asked the obvious question - what if you never landed to refuel, and instead brought the gasoline up to the airplane?

They painted a large question mark on the fuselage because nobody, not even the crew, knew the answer to the question the flight was asking: how long can an airplane stay up if it never has to land to feed itself?

Who Flew the Question Mark?

The crew was five men, and two of them went on to shape American airpower for the next three decades.

Major Carl “Tooey” Spaatz - commander, later the first Chief of Staff of the United States Air Force
Captain Ira Eaker - later commander of the Eighth Air Force over Europe
Lieutenant Harry Halverson
Lieutenant Elwood Quesada - another future general
Sergeant Roy Hooe - the flight mechanic who kept the three engines alive by hand

This was not a barnstorming crew. It was a slice of the future Air Force leadership, crammed into one drafty Fokker, taking turns crawling out onto a catwalk in flight to nurse an engine.

The airplane was stripped down and rebuilt for the mission: extra fuel tanks in the cabin, a catwalk so a man could reach the engines in flight, and a gravity tank plumbed so that fuel arriving from above could feed the whole system.

How Did Aerial Refueling Work in 1929?

The idea was not brand new. A pair of Army lieutenants had swapped a little gasoline between two aircraft back in 1923, mostly to prove it could be done without anyone dying. It could - barely. But no one had ever done it repeatedly, day and night, long enough to matter.

The Question Mark took off from Metropolitan Airport at Van Nuys, California, on January 1, 1929, and flew a long, lazy racetrack over Southern California between Los Angeles and San Diego, in full view of the public and the press.

The refueling aircraft were two more Fokkers - C-1s - each rigged with a cabin fuel tank and a 50-foot hose hanging out the bottom. There was no autopilot, no refueling boom, no computer, and no precision equipment of any kind.

The tanker would take station above and ahead of the Question Mark. A crewman fed the hose out into the slipstream, a length of rubber whipping in the wind with a nozzle on the end. Then a man on the Question Mark - often Sergeant Hooe - stood up in the open top hatch, in the freezing propwash, and reached up to catch it.

Two airplanes flew formation just feet apart while one man wrestled a live fuel line into the tank. Roughly 150 gallons of gasoline poured down under gravity while both aircraft held station - fumes everywhere, open exhaust stacks glowing feet away. One spark could have ended the flight in a fireball. They made contact 43 times, including at night, when the tanker crew rigged a light so the Question Mark could find the hose in the dark.

They passed more than fuel, too. Oil, food, water, batteries, messages, and spare parts all came down the hose or on ropes, including hot meals from the ground crew when they could manage it.

What Was It Like Inside the Airplane?

The record books skip the human cost, and it was steep.

It was deafeningly loud - three unmuffled radial engines, hour after hour, a wall of sound the crew could not talk over. They passed handwritten notes to communicate.

It was cold. Open hatches, a thin aluminum-and-fabric fuselage, and no real cabin heat against January air over the mountains.

And it stank - raw gasoline, hot oil, and exhaust, with five unwashed men living in a space the size of a delivery truck, sleeping on a cot wedged between the fuel tanks. The constant vibration wore the crew down.

Meanwhile, the country fell in love with them. This was happening in plain sight over Los Angeles, on the front page every morning, tracked by radio bulletins hour by hour. People drove to the airfield and craned their necks to listen for the three engines.

How Long Did the Question Mark Stay Up?

The final answer was 150 hours, 40 minutes - more than six days aloft. The crew did not come down because they had had enough; they came down because the center engine began running rough and Spaatz chose to land a tired airplane on his own terms rather than let it decide for him. On January 7, 1929, the Question Mark touched down gently at Metropolitan Airport before a crowd of thousands. The men who climbed out were filthy, deafened, and exhausted - and they had just rewritten what an airplane could do.

Why the Question Mark Still Matters

Endurance records get broken. Within a few years, other crews pushed flights past two, three, even four weeks aloft, and many of those became mere stunts. The Question Mark was different because the Army was not chasing a headline - it was running an experiment, and what it proved was aerial refueling itself: that fuel could be transferred reliably and repeatedly between aircraft, day and night, keeping a heavy airplane flying essentially forever as long as the engines held.

Everything that followed grew from that racetrack over Los Angeles. Every time a modern tanker tops off a fighter over the Pacific, or a bomber circles the globe nonstop with three or four in-flight refuelings, it traces back to the Question Mark. The idea of global reach - of an airplane whose range is limited only by the endurance of its crew - was born in that Fokker in the first week of 1929.

Spaatz and Eaker understood exactly what they had done. A decade and a half later, those same two men were directing the air war over Europe, standing on a foundation they had helped pour with their own frozen hands.

When the engines finally stopped after six and a half days, the crew said the silence was the strangest part. Some of them heard the engines ringing in their ears for days afterward.

Key Takeaways

The Question Mark, a Fokker C-2A, stayed aloft 150 hours and 40 minutes (over six days) above Los Angeles from January 1 to January 7, 1929.
It was refueled in flight 43 times by two Fokker C-1 tankers using a 50-foot hose, passing roughly 150 gallons per contact - entirely by hand, day and night.
The five-man crew included Carl Spaatz, later the first Air Force Chief of Staff, and Ira Eaker, later commander of the Eighth Air Force.
The flight’s real achievement was proving aerial refueling was reliable and repeatable - the foundation of modern long-range airpower and global reach.
It stands as the golden age at its best: showmanship on the surface, disciplined scientific experiment underneath.