Different levels of intensity echos from weather radar. Light blue might just mean clouds but green, orange, red, and purple are increasing intensities of showers/storms.
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Flightradar24 Support centerGray: The flight is scheduled and there isn't an additional status available. Green: The flight is estimated to be on time or arrived at time. Orange: The flight is estimated to be delayed or was delayed.
The dashed line is the flight's filed/planned route and is shown when we have that data available. That's the Wall to keep out the white-walkers. The dashed blue line is the intended flight plan route. The green line is where it actually went as tracked by reception of the ADS-B transmissions from the aircraft.
Yellow, Green and Red(Pink really) are basically used to indicate levels of rain. Green being Light rain with minimal turbulence and goes on to Pink showing heavy rain, hail with severe turbulence.
Flightradar24 is the more customizable of the two, and while FlightAware says it tracks more flights, it lacks options like showing planes on the ground. (There's also a third flight-tracking app and website, Planefinder, which looks and feels similar to Flightradar24 and has the same price for the premium version.)
Each color indicates a different flight status. Below are the meanings behind these colors: Gray: The flight is scheduled and there isn't an additional status available. Green: The flight is estimated to be on time or arrived at time. Orange: The flight is estimated to be delayed or was delayed.
Not being show on Flightaware just means they are on one of the block lists maintained by FAA and EASA. There are military encrypted transponders, that's something you can't receive locally. I've noticed i see tons of military aircraft on ADS-B Exchange but on Flight Aware they don't show up.
FlightAware compiles, aggregates, and processes data from over 50 government sources (in Europe, the Americas, and Oceania), dozens of airlines, commercial data providers, as well as thousands of receivers in FlightAware's ADS-B flight tracking network.
Red: When an aircraft is displayed as red that means that you are currently following that specific aircraft on the map or that an emergency squawk is on for this aircraft.
For flights that are no longer in our coverage area, we may estimate their position for up to 240 minutes. These flight tracks are shown as black dashed lines. Read more about estimated positions on Flightradar24.
A note about Estimated coverage: when you see a dashed or gray line behind an aircraft, that's estimated coverage. Colored lines indicate actual positions. When an aircraft is out of coverage, we estimate based on great circle routes to destination.