Not disagreeing, but how are you confident to rule out pacific? For the record I am not confident that this is a pacific loon but it looks interesting to me. Not liking the absence of a dark collar, which would clinch it. Looking to learn here because obviously probability is for rtlo. If it was just the bill or just the head shape, I would not even look twice but it’s both here for me. Round head suggestive bill. Could just be the photos. Honestly was hoping someone could tell me it’s a rtlo and explain how to know for sure.