SKYWATCH INCIDENT REPORT PRIMARY CODE: UNIDENTIFIED AERIAL PHENOMENON Date: 08:20 10/28/2023 Callsign: UAL541 Origin: DEN Status: Closed Aircraft: B738 Destination: BOS POD: DEN Tail Number: New Destination: Reporting Facility: ZOB Operator: UAL Operator Type: Commercial Paged: YES REMARKS Aircraft reported an unidentified aerial phenomenon off the left side while E bound at FL390, 40 NM W of BUF. The unknown phenomenon was 1 light that split into 2 lights flying in a crisscross pattern at approximately FL500 to FL600. SKYWATCH INCIDENT REPORT | DATE: 2023-10-28T08:20 | POD: DEN | PAGE 1 of 1