Yes, you can wear leggings on United (but airline can police your clothing).

Six tips to avoid getting kicked off a plane (leggings not included)

Can I Wear Leggings On A Flight To Nyc

Here's the Reason a Group of Girls Wearing Leggings Weren't Allowed to Board a United Airlines Flight

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Can I Wear Leggings On A Flight To Nyc

Can Airlines Force Passengers to Remove Religious Clothing? - FindLaw

Here's why United Airlines banned girls with leggings from a flight – New York Daily News

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Here's the Reason a Group of Girls Wearing Leggings Weren't Allowed to Board a United Airlines Flight

Hey, United Airlines! Your Leggings “Dress Code” Is Not Only Offensive, But Also Not on Trend

A decade of leggings controversy, explained - Vox

Bridget Foley's Diary: Much Ado About Leggings

United Airlines was right to bar leggings