United Airlines, like most major global carriers in 2026, has a high-fidelity protocol where blankets are laundered and sanitized at industrial facilities before being repackaged for reuse. On long-haul international flights, blankets are typically provided in sealed plastic bags, which is a high-fidelity indicator that the item has been professionally cleaned since its last use. On shorter domestic flights, blankets are less common in Economy but are often provided in First Class; these are also collected and sent for high-fidelity cleaning after every flight. It is highly unlikely that you would be given a blanket that was simply refolded by a crew member, as airline hygiene standards have significantly increased. However, for those with high-fidelity concerns about germs or sensitive skin, bringing a personal travel blanket is a common strategy. United also frequently partners with luxury brands like Saks Fifth Avenue for their high-fidelity Polaris business class bedding, ensuring a premium, clean experience for their highest-tier travelers.