Its a good thing. It means there is very healthy demand for the pipeline's services. Its not like an airline overbooking passangers on one of its planes. The customers overbooked. That happens frequently, or all the time, on some pipelines. Hopefully, Kinder can "twin" the line before any competitor can react, and have a much more profitable pipeline for the future. The Alberta tar sands oil has to go somewhere, and certain parties in the US don't want it over here.