I don't know where everyone is getting this idea that the ATP ride has to be done from the left seat. Doesn't Compass give their newhires ATP rides on their initial checkride? I fact, I don't know of any PTS that requires any checkride to be done from any given seat. We will be getting checked on our judgement and airmanship, not on our ability to operate the CRJ from the left seat. That's what upgrade training is for. When I was full time instructing I got an add-on rating (non CFI) and since I had been flying for hundreds of hours in the right seat and that was what I was comfortable with I did all my training and took my checkride in the right seat. It's definitely not the norm, but I don't see anything prohibiting a person attaining all their licenses and ratings without ever touching the left seat. Qualification rides (upgrade, initial) are seat specific. Any type of rating add on or certificate checkride is not.