Southwest Airlines—the commercial flying juggernaut that made peanuts an airplane staple 47 years ago—is now doing away with them for good. Starting August 1, the airline will no longer offer peanuts on any of its flights.

According to the company, it’s all about concern for people with allergies, ABC News reports. “Our ultimate goal is to create an environment where all customers—including those with peanut-related allergies—feel safe and welcome on every Southwest flight,” the airline said in a statement.

Southwest Airlines started offering free peanuts on all its flights in 1971. The practice, which later became synonymous with airplane travel, originally began as a cheeky marketing ploy. In an effort to lower prices, the airline stopped serving in-flight meals and told customers they could fly for peanuts, both literally and figuratively.

But the ubiquity of peanuts on airplanes soon became a concern for individuals with severe food allergies. Proponents of airplane peanut bans say severely allergic individuals can experience reactions from airborne peanut dust alone, but organizations like the American Peanut Council are predictably more skeptical. There’s not enough evidence that someone can experience severe allergic reactions from inhaling peanut dust, they say, so the claim may be a myth.

Fact is, there’s not a whole lot of concrete information on either side. In a 2008 article published in the Annals of Allergy, Asthma, and Immunology, researchers surveyed 471 people with a medical history of food allergies. Of that number, 41 said they’d experienced allergic reactions to food on commercial airline flights (mostly to peanuts), and 26 said those reactions had come from inhaled peanut dust. An unspecified number said their reactions had been life-threatening. But the study’s authors admitted within the article their methods had limitations—researchers recruited participants through newspaper advertisements, for one, and the data were all self-reported.

The lack of decisive evidence that airplane peanuts cause severe allergic reactions is one reason why airlines have historically been reluctant to make changes. In 2010, the Department of Transportation contemplated banning peanuts on planes, but it abandoned the idea after being reminded of a 2000 law that prohibits the department from enforcing any peanut bans without the support of a conclusive, peer-reviewed study showing severe reactions resulting from "contact with very small airborne peanut particles of the kind that passengers might encounter in an aircraft."

Further complicating the issue is the fact that severe allergies are considered a disability under the Americans with Disabilities Act. The ADA doesn’t regulate air travel discrimination, though, which is why the Air Carrier Access Act, or ACAA, was passed in 1986. The ACAA defines a disability as a “physical or mental impairment that substantially limits one or more major life activities.” Severe allergies fall under that (not being able to breathe or eat is a pretty significant impairment), but the ACAA doesn’t specify how airlines should treat customers with food allergies.

Most airlines have specific measures they’ll take in order to accommodate customers with peanut allergies, but such procedures are uneven across airlines, and can sometimes be uneven across flights of the same airline. JetBlue, for example, serves only peanut-free snacks and will make announcements about food allergies. Air Canada recently phased out nuts from all its in-flight food options, and it also offers to create a buffer zone between individuals with allergies and any allergens. Prior to banning peanuts, Southwest allowed people with allergies to pre-board in order to wipe down their seats, but it didn’t make any announcements discouraging passengers from eating peanuts.

Given the airline’s story, peanuts “forever will be part of Southwest's history and DNA,” the company said in a statement. But Southwest isn’t going to stop offering free food to customers who shell out the money for a flight. Passengers in the future can instead look forward to in-flight snacks of pretzels, cookies, veggie chips, and corn chips, CNN reports.

[h/t ABC News]