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

United Airlines says customers are 'welcome' to wear leggings — unlike teens who used special passes - Los Angeles Times

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No leggings on flights? Celebs blast United for 'terrible' dress code

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FRIDAY PONTE POCKET LEGGING

United Airlines caught up in leggings row - BBC News

Teenage girls barred from United flight over leggings - CBS News

United barred two girls from Denver flight for wearing leggings : r/Denver

Can Airlines Force Passengers to Remove Religious Clothing? - FindLaw

Can You Wear Leggings On An Airplane In Nc International Society of Precision Agriculture

Woman claims she was 'harassed' by American Airlines staff, told to remove 'f**k you' sweatpants

Twitter Drags United for Forcibly Dragging Passenger Off Plane

America Vs. Leggings: A Brief History