SKYWATCH INCIDENT REPORT PRIMARY CODE: UNIDENTIFIED AERIAL PHENOMENON Date: 01:00 02/01/2023 Callsign: DAL573 Origin: SEA Status: Closed Aircraft: B739 Destination: DTW POD: DEN Tail Number: New Destination: Reporting Facility: ZLC Operator: DAL Operator Type: Commercial Paged: NO REMARKS Aircraft observed a large silver balloon FL420-450 off the left side while east bound at FL330, 30 NM south of FCA. No evasive action was taken. ZLC checked with WX and TMU and no one has a report of having a balloon airborne. TY/JH notified. SKYWATCH INCIDENT REPORT | DATE: 2023-02-01T01:00 | POD: DEN | PAGE 1 of 1