Feel like your coach seat on an overseas flight is a tighter squeeze? You’re probably right.

Airlines already have been wedging in more passengers by swapping heavily padded seats for ones with thinner backs or reducing the distance between rows. On wide-body aircraft typically used on international flights and certain long domestic routes, some now are adding an extra seat to each row.

The result: a little less elbow room that may mean battles over armrest turf on your next flight cross-country or abroad.

When Boeing introduced its wide-body 777 in 1995, most airlines placed orders for aircraft with nine seats across in coach.

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But that’s changing — international carriers like Air France, Emirates, Etihad and British Airways all use or say they’re moving to 10-seat rows. American Airlines began modifying its existing 777s to fly with 10-seat rows in 2014, though some will keep the roomier nine-across rows with extra legroom in the more expensive Main Cabin Extra section, said spokeswoman Leslie Scott.

The 14 new Boeing 777-300s United Airlines expects to receive this year have started arriving with the airline’s new lie-flat Polaris business class seat in front and the tighter 10-seat layout in the back. United also is adding the extra seats on 19 of its older 777-200 aircraft that came with a nine-seat configuration, but hasn’t said whether it plans to make similar changes to the rest of its 777s.

Most airlines using the Boeing 787 Dreamliner, which can be outfitted with either eight or nine seats per row, also have picked the tighter version, according to Seth Kaplan, managing partner of industry newsletter Airline Weekly.

Each seat on a Boeing 777 with ten-seat rows is about 17 inches wide — roughly an inch less than on a nine-seat version of that plane.

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An inch might not sound like much. But passengers can feel the difference, especially on the lengthy flights where they’re most likely to encounter a 777, Kaplan said.

"If you’re not that tall, you probably care more about width than legroom," Kaplan said.

Adding a seat and taking away those inches can add up — in terms of both passengers and revenue.

On United’s older 777-200s, the 19 aircraft with 10-seat rows will carry anywhere from 20 to 98 more passengers than the nine-seat version, depending on the overall layout.

It doesn’t cost much to add a few extra passengers to a flight beyond a little extra fuel to carry added weight and potentially an extra flight attendant. The extra revenue to be had from selling a few more airfares is "almost always" greater, United Chief Financial Officer Andrew Levy said at a conference this month.

On average, each United flight this year is taking off with about 5 percent more seats, Levy said. That’s primarily because United is swapping small regional jets for bigger aircraft. But about 20 percent of the growth comes from switching to seats with thinner backs and packing more of those seats on each aircraft, said United spokeswoman Megan McCarthy.

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"We’re behind in this, quite frankly," Levy said.

Industrywide, the average number of seats on flights departing from the U.S. has grown nearly 17 percent over the last decade, according to Khalid Usman, vice president at consultant Oliver Wyman.

As at United, most of that comes from a shift away from the smallest regional planes. Aircraft with at most 50 seats accounted for about 24 percent of all flights departing from the U.S. last year, down from 41 percent in 2006, Usman said. But fitting more seats on aircraft has contributed too.

Usman is skeptical that airlines will be as aggressive in rolling out tighter rows as they have been in moving to seats with slimmer backs, which can save inches and weight without further cramping travelers.

"There’s a fine line as to how much you can do without irritating customers," Usman said.

Delta Air Lines said it will stick with nine seats on its Boeing 777s, citing customer feedback on the importance of seat comfort on long-haul flights.

The silver lining? After airlines finish rolling out already-announced changes affecting passengers’ personal space, there’s not a lot of room for more squeezing.

"American, United and Delta do need to give people reasons to fly those rather than Spirit and they know that," Kaplan said. "They’re pretty much up against the limits of what they can do."

lzumbach@chicagotribune.com

Twitter @laurenzumbach

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