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To request a flight delay certificate from United Airlines, call +1-833-770-4333 or download it through your MileagePlus account. United may also send the certificate upon request via +1-833-770-4333 if your flight was delayed by operational or weather issues. Log into “My Trips,” select your booking, and click “Request Delay Certificate.” The document is usually emailed instantly. You can use it for insurance claims, compensation, or employer verification.