The map shows real air traffic, live. The board lists cancelled flights (invented, between real airports, in real airlines' aircraft). Take one, fly it to its destination and collect the points. The other pilots fly on the same map.
A new name creates your account; your points are saved to it. There is no email and no password reset, so remember it.
You start in Easy, where you only steer. Normal and Hard give you more of the controls and pay about twice as much.