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However, the airline explained that it was a temporary switch.
In a tweet on Friday, United said Oreo Thins would be a free snack option on March 1, but that the beloved Biscoff cookies would return on May 1.
All three airlines offer other complimentary snack options as well, including non-alcoholic beverages on all three airlines, pretzels and snack mix on United, pretzels on American and almonds, Cheez-It crackers and KIND Dark Chocolate Chunk bars on Delta.
Even though United is planning to bring the Biscoff cookies back as a snack option, not all iconic complimentary airline snacks are still available today. Some have been left by the wayside while others have continued to thrive.
Scroll down to see some of the most iconic airline snacks and where they are today.
Stroopwafel - United
United's recent decision to temporarily remove Biscoff cookies from its snack options isn't the first time the airline has received backlash for taking away a fan favorite.
In United's tweet from Friday, the airline said that Stroopwafels will be "here always."
Peanuts - Southwest
Southwest made the decision -- after several other airlines did, too -- particularly for passengers who have peanut-related allergies.
The airline still offers free pretzels and non-alcoholic drinks on flights, according to the website. And though the peanuts are no longer free, fans can buy them in tins online for $29, along with other peanut-themed merchandise.
Terra Blue chips - JetBlue
In JetBlue's 20 years as an airline, it has reportedly served 102 million bags of its iconic Terra-brand Sweets & Blues potato chips, according to a press release. The chips have been JetBlue's official signature snack since the airline launched in 2000.
JetBlue also offers free drinks and free, brand name snacks including Cheez-Its, Rold Gold pretzels, PopCorners popcorn chips and Belgian Boys cookies, according to the website.
|UAL||UNITED AIRLINES HLDG.||22.89||-0.54||-2.28%|
|LUV||SOUTHWEST AIRLINES CO.||30.54||-0.96||-3.05%|
|AAL||AMERICAN AIRLINES GROUP INC.||9.39||-0.67||-6.66%|
|DAL||DELTA AIR LINES INC.||22.48||-0.20||-0.88%|
|ALGT||ALLEGIANT TRAVEL CO.||69.35||-0.15||-0.22%|
|SAVE||SPIRIT AIRLINES INC.||10.51||-0.02||-0.19%|
|FTR||FRONTIER COMMUNICATIONS CORP||0.35||-0.01||-2.78%|