SKYWATCH INCIDENT REPORT PRIMARY CODE: UNIDENTIFIED AERIAL PHENOMENON Date: 09:25 10/04/2023 Callsign: DAL2779 Origin: LAS Status: Closed Aircraft: B739 Destination: MSP POD: DEN Tail Number: New Destination: Reporting Facility: ZDV Operator: DAL Operator Type: Commercial Paged: YES MOR Init: YES MOR ID: ZDV-M-2023/10/04-0002 REMARKS Aircraft reported an unidentified aerial phenomenon off the left side while at FL390, 83NM NE of BFF. The unknown phenomenon was three bright white lights, not moving or changing altitude, blinking left to right and right to left. SKYWATCH INCIDENT REPORT | DATE: 2023-10-04T09:25 | POD: DEN | PAGE 1 of 1