[tlrobinson]

Sure it's possible (see: http://en.wikipedia.org/wiki/IP_over_Avian_Carriers). I don't know why they haven't done it yet.

[Xurinos]

You are referring to the lowest OSI layer. It is easy to propose laying out new line (or network of birds), but the costs are huge.

http://img.tfd.com/cde/OSI.GIF

[fs111]

OSI? Really? http://pablotron.org/files/7_layer_burrito.html