Why Do Planes Disappear on Flightradar24?

I was following an aircraft when it suddenly disappeared, why? In most cases, our receiver network is no longer receiving a signal from the aircraft. This tends to be more common when an aircraft is flying over large bodies of water. It can also be a technical problem somewhere.

Why are some planes not on Flightradar24?

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.

What does it mean if a plane is red on Flightradar24?

Flightradar24 on Twitter: "Red icons indicate aircraft that are squawking 7600 or 7700.