Originally Posted by
6rugrats
I am not sure I understand your question. Your posted example seems to clearly show what airline is operating the flights. I have never seen a booking that didn't list the actual metal on which you'll be flying before you make your purchase.
If you don't like that carrier, choose the flights with your preferred one.
In the above example, it would appear both Virgin and Delta are operating the LHR > SFO via SEA 12:35 - 16:25?