No, you are not allowed to take United Airlines blankets home with you after your flight. These items, along with pillows and headphones, are the property of the airline and are intended to be laundered and reused for future passengers. This applies to both the standard fleece blankets in Economy and the high-end Saks Fifth Avenue bedding found in the Polaris Business Class cabins. Removing these items from the aircraft is technically considered theft, and flight attendants are trained to collect them before landing. If you are caught taking them, you could face an uncomfortable confrontation or, in extreme cases, a charge to your account. However, you are permitted to keep the amenity kits (containing socks, eye masks, and skincare) and any "disposable" items provided in premium cabins. If you truly love the quality of the Saks Fifth Avenue blankets, United often sells them on their official online "United Shop" for personal use.