In 2026, the general rule across almost all international airlines is that you cannot keep the business class blanket. Unlike amenity kits (which are yours to take) and slippers, blankets are high-value, multi-use items that are professionally laundered and sanitized for future passengers. To combat theft, many premium carriers like British Airways, Emirates, and United now use RFID tagging or specific inventory tracking to ensure these items remain onboard. Taking one is technically considered theft and can lead to a "cleaning fee" being charged to your card on file or, in extreme cases, being blacklisted from the airline's loyalty program. If you find the blanket particularly comfortable, many airlines now offer them for sale in their online boutique stores, allowing you to own a brand-new version of the bedding without risking a confrontation with cabin crew.