I have been looking at FC between BWI and SNA and notice that my choices inbound (SNA-BWI) include a few flights that show 0% EQM. Oddly, these are the flights that go through IAH or EWR. I also note that, while none of the flights have an "Operated By" qualifier, the flight numbers are all CO1xxx. I thought 4 digit flight numbers were supposed to indicate code shares?