WATCH | Airlines have dress codes, and not just for passengers using travel passes.
UPDATE March 27, 9:11 a.m.:
United's controversial decision to force two girls to change before boarding a flight because they were wearing leggings sparked many celebrities to weigh in, nearly all harshly critical of the airline.
Jonathan Guerin, spokesman for United, told The New York Times the airline's "employee pass" program came with a stricter dress code.
"We are always engaging with our customers as quickly as possible," Guerin said of the airline's response on Twitter.
I have flown united before with literally no pants on. Just a top as a dress. Next time I will wear only jeans and a scarf.— christine teigen (@chrissyteigen) March 26, 2017
Chrissy Teigen promised to test United's dress code.
Actor LeVar Burton saw United's point, but still called it "not a good look."
If you don't think telling a 10-year-old girl to cover her already covered legs while her Dad is boarding in shorts is a problem, ur lost— Lexi Alexander (@Lexialex) March 26, 2017
Filmmaker Lexi Alexander pointed out an apparent double standard.
As #Leggingsgate took off, Twitter was naturally flooded with jokes.
Others wondered why the incident got so much attention.
And some jumped to United's defense.
ORIGINAL STORY: A United Airlines employee sparked a social media firestorm Sunday by preventing two teenage girls from boarding a flight from Denver to Minneapolis because they were wearing leggings.
Shannon Watts, the founder of the anti-gun violence group Moms Demand Action, tweeted about the incident as it was happening.
"I guess @united [is] not letting women wear athletic wear?" she tweeted.
United initially responded to the tweets saying, "United shall have the right to refuse passengers who are not properly clothed via our Contract of Carriage.”
That tweet just added fuel to the fire for those following the incident on social media. The response prompted many people to ask the airline whether it was saying it could deny service to customers just because of their attire.
Leggings are business attire for 10 year olds. Their business is being children.— Patricia Arquette (@PattyArquette) March 26, 2017
After actress Patricia Arquette got in on the conversation, the airline clarified its statement.
"The passengers this morning were United pass riders who were not in compliance with our dress code policy for company benefit travel," United tweeted.
United Airlines spokesman Jonathan Guerin told The Washington Post that the internal policy for employees specifically forbids leggings. Because the teens were traveling under an employee travel pass, that dress code applied to them as well.
Guerin added that the teens agreed to change and were switched to a later flight.
The whole debacle prompted the hashtag #leggingsgate.