This dataset covers four days of ADS-B traffic at Harry Reid International Airport (KLAS) from January 1 through January 4, 2026, captured on the 43rd anniversary of Terminal 1's opening. Over that span, 3,853 flights were recorded, split nearly evenly between 1,903 arrivals and 1,950 departures, with 1,484 unique aircraft tracked across 3,495,106 position reports. January 1 was the quietest day at 775 total movements, while January 2 peaked at 1,038. The airport operated around the clock, with the busiest single hour falling at 14:00 PST, which logged 282 flights, 184 of them departures. Activity dropped sharply in the early morning hours, with just 16 total movements recorded at 03:00. Arrivals dominated the late afternoon and evening window, particularly between 16:00 and 20:00, while departures led from morning through mid-afternoon. Nellis Air Force Base (KLSV) topped the route list with 240 combined movements, ahead of Los Angeles International (KLAX) at 206. San Francisco (KSFO), Hollywood Burbank (KBUR), and Seattle-Tacoma (KSEA) rounded out the next three. Approach and departure directions were dominated by ENE and E headings, each accounting for over 300 to 400 movements, with SW third in both categories. The fleet was predominantly US-registered, with 1,368 of 1,484 unique aircraft flagged to the United States. Canadian-registered aircraft numbered 48, followed by 42 with unresolved country codes. The altitude distribution shows a dense concentration of position reports between 2,000 and 3,000 feet, reflecting terminal maneuvering activity around the airport's 2,181-foot elevation. Cruise-level activity clustered between 30,000 and 38,000 feet, with peaks at the 35,000-36,000 and 37,000-38,000 foot bands. The highest-recorded flight reached 50,200 feet, operated by N122GA arriving from Lynden Pindling International in Nassau. The longest flight by distance was 2,962.1 nautical miles, an arrival from Hartsfield-Jackson Atlanta flown by N350FR over 788.6 minutes. Average groundspeed across all tracked flights was 257 knots, with a maximum of 619.2 knots recorded in the dataset.