Through my few months of flight experience I have noticed that there are numerous General Aviation airplanes that have pedal breaking capabilities only from the left seat; the Cherokee and Arrow come to my mind the quickest. On the other hand I read an article several months ago about the DC9-20s used by SAS (I believe they are out of service now) and it said that steering the aircraft on the ground while taxiing was only possible from the Captain's seat. My question is are there anymore airliners like the DC9-20 that can only be steered from the left side? Or is it even a common item to most airliners? I am puzzled about this questions and would like to hear your input on this.