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The user, who goes by the name of @sierrasteadman, told followers how her perfectly normal pair of baggy white shorts and a black crop top had offended the air hostess, who told her what she was wearing was inappropriate.
"I've never felt more degraded, ashamed, embarrassed, angry or sad. F ALASKA AIRLINES!!!!!!!," she wrote as she shared a video of herself crying on the app.
And alongside the video, a caption read: "When a flight attendant sl*t shames you in front of the whole plane and threatens to kick you off for what you're wearing".
In a follow up clip, she explained: "When I got on the plane, she immediately stopped me before I even got to my seat, and told me to zip up my jacket.
"I shook my head like this (nods head) and started to zip up my jacket, and then started to walk to my seat.
"That should have been the end of that."
But it wasn't. It seems the air hostess had more to say.
"Instead she decided to grab my arm and pull me back, to then start yelling at me in front of everybody.
"That is where the problem lies. I had no problem with her asking me to zip up my jacket.
"I don't think there was anything wrong with what I was wearing but if she wants me to zip up my jacket I will...
"But the things that happened after that, especially where she grabbed me, it's like... this is not okay".
After returning home, Sierra told followers that her mum had written a letter complaining to the airline, who responded by conceding "it is apparent that we have failed".
"You and your daughter should expect nothing less than to be treated with the utmost respect, compassion and care.
"It is truly disappointing to hear that you both did not feel that way during boarding and during the interactions with the Flight Attendant.
"We want to assure you that we take these matters very seriously and have shared your concern with our Inflight Management team that will conduct an internal investigation.
"Due to privacy concerns we will not be able to disclose any findings, but can guarantee you that this will be reviewed."
They signed off: "On behalf of Alaska, I'd like to sincerely apologise for Sierra's experience with our Flight Attendant and apologise for how this was handled."
Tyla has contacted Alaska Airlines for comment.
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