I am trying to get the commercial license requirements out of the way, and I am looking at the 300nm solo cross country. I have had a number of cross countries that meet or exceed the requirements, however, they have all been with (non-flying) passengers. I was always under the distinct impression that solo meant the 'sole occupant' of the aircraft, however, my instructor and a FED at the Dallas FSDO believe otherwise. The say that the definition only applies to student pilots, and once you are privately rated any time flown that does not have and instructor or another pilot on board can be logged as solo. To me that sounds incorrect, what do you think?