i misunderstood the original post. i thought he meant overtaking on the left in autos on the ground (which would be weird, as you guys drive on the left). i'm not sure in what situation one would overtake another moving aircraft on the ground?
Our FARs state that "Overtaking. Each aircraft that is being overtaken has the right-of-way and each pilot of an overtaking aircraft shall alter course to the right to pass well clear."
maybe you guys took it from us?
they don't specify for ground operations. they only give guidelines for water ops which require that "Each aircraft or vessel that is being overtaken has the right-of-way, and the one overtaking shall alter course to keep well clear"