Satellites, radar, interpolation up to 120 minutes, and receivers on islands. https://www.flightradar24.com/blog/the-evolution-of-flightradar24-coverage/ https

Satellites, radar, interpolation up to 120 minutes, and receivers on islands. https://www.flightradar24.com/blog/the-evolution-of-flightradar24-coverage/ https://www.flightradar24.com/blog/the-evolution-of-flightra... https://www.flightradar24.com/blog/over-the-ocean-24-hours-of-transatlantic-flight/ https://www.flightradar24.com/blog/over-the-ocean-24-hours-o... https://www.flightradar24.com/blog/tracking-flights-with-satellite-based-ads-b-receivers/ https://www.flightradar24.com/blog/tracking-flights-with-sat...