This page visualizes ADS-B traffic data for Hartsfield-Jackson Atlanta International Airport (ATL/KATL) captured on September 21, 2025, the 45th anniversary of the modern airport's opening as William B. Hartsfield Atlanta International Airport. The dataset covers the full calendar day from 00:00 to 23:59 EDT, logging 2,242 total flights across 1,112 arrivals, 1,130 departures, and 142 ground operations. A fleet of 699 unique aircraft generated over 1.76 million ADS-B position points, averaging 93.4 flights per hour across the day. Traffic was sparse through the overnight hours, reaching a low of just 1 flight at 2:00 AM, then building through the morning. The busiest single hour was 16:00 EDT with 152 movements (66 arrivals, 86 departures). Hours 8 through 23 each sustained totals above 90 flights. LaGuardia (LGA) led all routes with 39 total movements, followed by Orlando (MCO) and Tampa (TPA) at 34 and 32. Northeast was the dominant approach and departure direction for both arriving and departing traffic. The top-10 routes were all domestic US destinations concentrated in the Northeast, Mid-Atlantic, Florida, and Midwest. Altitude data spans from ground level to a peak of 48,875 feet, recorded on a departure to Moffett Federal Airfield (NUQ) by tail number N890RW. The most concentrated cruise band sits between 35,000 and 37,000 feet. Average groundspeed across all tracked flights was 281 knots, with a maximum of 592.6 knots. The average leg distance was 609.9 nautical miles at an average duration of 106.5 minutes. Registered aircraft were predominantly US-registered (664 of 699), with smaller counts from Canada, Germany, the United Kingdom, South Korea, and several other countries.