A little-known deli chain is gearing up to be the next Chick-fil-A

Chick-Fil-A Is America's Favorite Fast Food Restaurant, Report Says

A small deli chain was just named one of the most profitable restaurant chains in the US.

Jason's Deli was No. 2 on QSR Magazine's ranking of the average sales per unit of the 50 biggest brands in the quick-service industry. The deli chain only trailed behind industry champion Chick-fil-A.

While the chain has just 260 locations, a single restaurant made an average of $2,664,000 in sales in 2015. That's six time as much as deli rival Subway, with average unit sales of just $424,300.

Average unit sales are a key measure of success in the restaurant business.

Long-time leader of the list, Chick-fil-A, proves just how important the figure is for measuring growth — the chain's high average sales per restaurant allowed it to become the No. 1 chicken chain in the US by sales, despite having less than half of the number of restaurants as rival KFC.

The first Jason's Deli was opened in 1976, in Beaumont, Texas.

Discover fast-food from around the world:

Fast food from around the world
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Fast food from around the world
McDonald's Japan serves rice cheese balls! A crispy outside with a warm, gooey inside -- YUM.
McDonald's India features the McAloo wrap. Aloo is a type of potato curry and McDonald's put its own spin on it by wrapping a flour tortilla around an aloo patty garnished with lettuce, onions, vegetables, and sauce.
Pizza Hut Russia serves an Oktoberfest seasonal pizza with Bavarian sausage, pepperoni, vegetables, sauce, and mustard. You like?
At Burger King Argentina you can order a Churrasquito. It's grilled over hot coals and served with cheese, lettuce, tomato, and mayo.
At select Wendy's locations in Australia, you can order a Brekky dog -- a breakfast style hot dog. GOOD MORNING to that!
Taco Bell Japan serves a shrimp and avocado burrito. This exclusive item has only been on the menu since April 2015!
Known as 'Maccas' in New Zealand, McDonald's menu there includes 3 savory pies. This one is the Mince 'N' Cheese pie stuffed with ground beef and cheese. 
At Pizza Hut in Saudi Arabia you can order a seafood pizza, including shrimp, calamari, crab, and vegetables on a thin crust.
McDonald's serves porridge in Thailand! 
You can order chili cheese nuggets from Burger King in Hungary. Bits of jalapeño peppers and a spicy kick.

The chain is known for its deli classics: soups, sandwiches, and salads. Since 1980, chain's signature sandwich has been the Muffaletta, a New Orleans favorite made on crusty, grilled bread.

Jason's Deli has a more extensive menu than most fast-food or fast-casual chains, however, with pasta, baked potatoes, chicken nuggets, and even a full salad bar.

Also notable: the chain serves up free soft serve ice cream to all customers.

Despite its basic deli feel, the chain has doubled down on nutrition in recent years.

In 2005, the chain debuted its vegetarian menu and stopped using partially hydrogenated oils. Since then, the chain has cut MSG, high-fructose corn syrup, and artificial colors and dyes from the menu. The chain has also launched gluten-sensitive and vegan menus.

As the chain updates its menu, it has also begun to update its technology. In 2015, the company launched drive-thru concept Jason's Express, and in April, announced it had begun a test of delivery with DoorDash.

Part of the reason why Jason's Deli's average unit sales are so impressive is because menu prices are simply higher than competitors like Chick-fil-A and McDonald's. However, as sandwich standbys such as Subway struggle, the ongoing success of Jason's Deli could signal that the chain has the potential to win over Americans in search of a new deli.

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RELATED: Check out photos of secret fast food menu items from your favorite chains:

Secret fast food menu items
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Secret fast food menu items
"Mc10:35" from McDonald's 
"Apple Pie McFlurry" from McDonald's

“Animal Style” Burger/Fries from In-N-Out

Starbucks' "Butterbeer Frappuccino"

Burger King's "Rodeo Burger"

A triple-layered drink from Starbucks

McDonald's' "McGangBang Sandwich"
Starbucks' "Nutella Frappuccino"
Chipotle's "Quesarito"
"Green Tea and Cotton Candy Frappés" from Starbucks
Dairy Queen's "Arctic Rush Float"
“Grand Slam" from Wendy's
"Neapolitan Milkshake" from McDonald's

"Thin Mint Frappuccino" from Starbucks

Subway's "Pizza Sub"

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