United Airlines's reply to the previous article

Jonathan Guerin, a spokesman for United, confirmed that two teenage girls were told they could not board a flight from Denver to Minneapolis because their leggings violated the company’s dress code policy for “pass travelers,” a company benefit that allows United employees and their dependents to travel for free on a standby basis.

Mr. Guerin said pass travelers are “representing” the company and as such are not allowed to wear Lycra and spandex leggings, tattered or ripped jeans, midriff shirts, flip-flops or any article of clothing that shows their undergarments.

“It’s not that we want our standby travelers to come in wearing a suit and tie or that sort of thing,” he said. “We want people to be comfortable when they travel as long as it’s neat and in good taste for that environment.”

He said both teenage girls stayed behind in Denver, “made an adjustment” to their outfits and waited for the next flight to Minneapolis. Mr. Guerin did not know if they had successfully boarded or not, and also had no information about the girl Ms. Watts said she saw change into a dress at the gate.

The company largely confirmed Ms. Watts’s account earlier in the day in a response to her on Twitter that did little to mollify the concerns of its critics.

In a series of dozens of tweets, the company said the incident was not simply the result of an overzealous gate agent. Instead, it said United Airlines reserved the right to deny service to anyone its employees deemed to be inappropriately dressed. It also referred to the dress code applied to pass travelers.

“In our Contract of Carriage, Rule 21, we do have the right to refuse transport for passengers who are barefoot or not properly clothed,” the company tweeted. It added, “There is a dress code for pass travelers as they are representing UA when they fly.”

As we can read here, they were not normal passengers, but pass travellers, who were supposed to accept the company's dress code when flying. The previous information was just partial. We should be given the whole information before we shape an opinion.