LOS ANGELES — Elinor Otto braces her slight frame and grips the riveting gun with both hands, her bright red hair and flowered sweater a blossom of color in Long Beach, Calif.’s clanking Boeing C-17 plant.

Boom, boom, boom.

She leans back as the gun’s hammer quickly smacks the fasteners into place.

Then she puts the tool in a holster and zips around a wing spar to grab a handful of colorful screw-on backs, picking up another gun along the way to finish them off. Her movements are deft and precise.

“Don’t get in her way, she’ll run you over,” a co-worker says with a smile.

Otto finishes a section of fasteners, looks up and shrugs.

“That’s it.”

Just another day at the office for a 93-year-old “Rosie the Riveter” who stepped into a San Diego County factory in 1942 — and is still working on the assembly line today.

Otto is something of a legend among her co-workers on the state’s last large military aircraft production line. And her legend is growing: She was recently honored when Long Beach opened Rosie the Riveter Park next to the site of the former Douglas Aircraft plant, where women worked during World War II.

“She says, ‘We can do it!’ and I’m doing it!” Otto says, flexing her thin arm and laughing, mimicking the iconic poster.

If she were younger, she jokes, she would look at herself now and wonder, “What’s that old bag still doing here?”

But Otto seems to have more energy than those half a century younger.

“I wish I was in as gooda shape as she’s in at my age,” says fellow structural mechanic Kim Kearns — who is 56.

Otto is out of bed at 4 a.m. and drives to work early to grab a coffee and a newspaper before the 6 a.m. meeting. In the Boeing lot, she parks as far from the plant as possible so she can get some exercise. Every Thursday, she brings in cookies and goes to the beauty parlor to have her hair and nails touched up after her shift ends.

“She’s an inspiration,” says Craig Ryba, another structural mechanic. “She just enjoys working and enjoys life.”

Otto was beautiful, with bright blue eyes and dark hair piled high, when she joined a small group of women at Rohr Aircraft in Chula Vista, Calif., during World War II. The bosses threatened to give demerits to the men who stood around trying to talk to her — so Otto’s suitors left notes for her in the phone booth, where she called her mother every day.

Back then, everyone worked for the war effort, Otto says, so they didn’t think much of their jobs — it was tough to find good ones. World War II was all-consuming, with product rationing and scrap metal collections, and men leaving for the war.

Otto joined the war effort with her two sisters, one who worked alongside her at Rohr, the other a welder in a Bay Area shipyard. She was newly single with a young son.

“During those days, we could hardly find an apartment that would let you rent with kids. My goodness, they’re going to go to war someday and they can’t even live in an apartment,” says Otto, who had to board her son out during the week. “It cost $20 a week, and it was hard because I made 65 cents an hour.”

At the plant, she would make the others laugh at how fast she could rivet, she says, quickly moving her hands and stomping her feet to demonstrate.

Days after the war ended, Otto and other women were let go as men returned home.

“They needed us at one time, and when the war was over, they let us go,” she says. “That’s how it was.”

After the war ended, Otto tried other jobs, but sitting in an office drove her nuts — she hates being still.

Car-hopping worked out until roller skates were added to the uniform.

So she worked for Ryan Aeronautical in San Diego for 14 years, until she was laid off.

At a party nearly a year later, a girlfriend told her to get to Los Angeles as fast as she could. Douglas Aircraft was hiring women for the first time since the war. A car full of women left for Long Beach that night, she says, and were hired right away.

In its heyday, Otto says, the C-17 plant was fully staffed with a parking lot so big that workers put flags on their cars to find them in the sea of vehicles. Long Beach was a hub of production during the war and after, but in the decades since, the aerospace industry in the city has shrunk as demand for military aircraft has fallen. In mergers over those years, Douglas became McDonnell Douglas, which later joined with the Boeing.

On Sept. 12, the Air Force ended its 32-year relationship with the Long Beach plant as it received its 223rd and final cargo jet. Foreign sales are few and small, but will keep the plant running until late 2014. Boeing will soon make a decision about the future of the production.

The great-grandmother says she would like to retire soon as well, but she refuses to become a couch potato (“Gotta keep moving!”). She’s worked so long for economic reasons — she cared for her mother and son for years — but also because of her endless energy.

“When I go to heaven,” she says with a laugh, “I hope God keeps me busy!”