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

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

Can we wear knee caps under leggings? - Quora

Teens Wearing Leggings Not Allowed To Board United Airlines Flight

United Airlines Leggings Incident Shows Changing Nature of Air Travel

Leggings on United Airlines: See Which Stars Wear Leggings to Fly

Can I Wear Leggings On A Flight To Nyc

Outrage, Explanations After United Turns Away Girls From Flight For Wearing Leggings : The Two-Way : NPR

Can you wear leggings on a plane? - Quora

Outrage, Explanations After United Turns Away Girls From Flight For Wearing Leggings : The Two-Way : NPR

Can guys wear leggings like girls? - Quora

United Airlines Refused to Let Passengers on Board Wearing Leggings

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Outrage, Explanations After United Turns Away Girls From Flight

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Barred from flight for wearing leggings