SKYWATCH INCIDENT REPORT PRIMARY CODE: UNIDENTIFIED AERIAL PHENOMENON Date: 14:00 02/03/2023 Callsign: UAL532 Origin: DEN Status: Closed Aircraft: B738 Destination: ORD POD: DEN Tail Number: New Destination: Reporting Facility: ZDV Operator: UAL Operator Type: Commercial Paged: NO REMARKS Aircraft reported large balloon they passed under while E bound at FL390, 20NM E of PWK. SKYWATCH INCIDENT REPORT | DATE: 2023-02-03T14:00 | POD: DEN | PAGE 1 of 1