Re: Any tips on creating a globe with planes flying around leaving journey lines?

If you have trapcode particular, you can use a similar method to kevin's without the described problems with the echo effect.
Simply create a null for each plane, animate the null, pickwip the plane position to the null, create a new solid and apply particular, pickwip the emitter position to the null, turn the velocity to 0 and change the particle life to however long you need. Then, you only need to adjust the particle amount until you get a solid line. This depends largely on the speed of the plane.

You can also do this in true 3d and have the planes fly around the globe. Although you might be limited by the 2d nature of the plane images you are using.

simply duplicate the layers and adjust the null and you have an easy way for multiple planes to have trails following them perfectly.