It all kicked off on Sunday when two teenage girls, who were wearing leggings, were barred from boarding a United Airlines flight.
A company spokesperson said it was because they didn't meet a certain dress code put in place for special pass travellers.
If the girls had been paying customers, they would not have been refused entry on to the plane, the spokesperson added.
Shannon Watts, who was also travelling on the plane, overheard the conversation and she took to twitter to voice her disgust, "This behaviour is sexist and sexualises young girls. Not to mention that the families were mortified and inconvenienced."
A 10 year old girl had to change out of LEGGINGS on a United flight. We're still policing women and telling them what to wear. It's 2017.
— Emilia🇺 (@PoliticalEmilia) March 26, 2017
The tweets led to thousands of women voicing their disappointment over United Airlines's decision to ban the girls from travelling, with celebrities getting involved in the conversation too.
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