Callsign AZU is Azul
WHAT AIRLINE IS AZU?
AZU is the ICAO three-letter callsign prefix for Azul. When a radio scanner, flight tracker or radar scope shows a flight like AZU123 or AZU45XY overhead, that's a Azul aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with AZU for its type, registration, route and photo.