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

American Airlines relaxes employee travel dress code — and, yes, leggings are allowed

Can You Wear Leggings On United Airlines? – solowomen

United Airlines in Twitter trouble over dress code rules, leggings

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Why We Lost Our Minds Over Leggings

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United Airlines: 'Your leggings are welcome' — as long as you're paying for your flight - The Washington Post

United Bans Girls for Wearing Leggings

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Can I Wear Leggings On A Flight To Nyc

Do you wear tights or leggings under your dress? - Quora

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

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

United Airlines was right to bar leggings