Dark blue means they are over deep water. Light blue means they are over shallow water. Green means they are over grass. White means they are over snow or concrete. Purple means they are purplexed.
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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.
Red: When an aircraft is displayed as red that means that you are currently following that specific aircraft on the map or that the aircraft's transponder is squawking an emergency code. These codes are 7600 (Communication Equipment Failure), and 7700 (General Emergency).
A Squawk 7700 indicates an emergency. This can be an emergency of any kind. Pilots may input it into the transponder themselves – or when instructed to do so by ATC. As a result, ground control will know that the aircraft is dealing with a serious issue and needs help.
The Help of Lights When Flying at Night. Planes have headlights so that pilots can see what is in front of them. Unfortunately, they are only effective during takeoffs and landings. Even with the slight illumination offered by the headlights, only darkness is visible when looking out the front window of a cockpit.
The biggest reason for flying at higher altitudes lies in fuel efficiency. The thin air creates less drag on the aircraft, which means the plane can use less fuel in order to maintain speed. Less wind resistance, more power, less effort, so to speak.
The dimming of cabin lights only happens when it is dusk, dawn or dark outside the aircraft. This is a safety measure, and is to ensure your eyes are adjusted to the gloom enough to see the floor lights leading you to safety along the aisle in the event of a crash or emergency evacuation.
A flight may not be visible on Flightradar24 for different reasons, but most likely it is either outside our coverage in that area or not equipped with a compatible transponder or a combination of the two.
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.
What is the longest flight in the world by distance? The longest flight in the world by distance is New York (JFK) to Singapore (SIN) on Singapore Airlines clocking in at 9,537 miles. What plane can fly the farthest in the world?
The position is calculated based on many different parameters and in most cases it's quite accurate, but for long flights the position can in worst cases be up to about 100 km (55 miles) off. In settings there is an option to set for how long time you want to see estimated aircraft on map.