I am seeing 6 options for the outbound all connecting through DFW.
Could you clarify the routing you are expecting?
Sometimes if you've done a few searches, the preference may switch to "schedule" rather than "price and schedule" resulting in fewer flights; perhaps check this as well.

I obviously misunderstood your question, but nevertheless, JohnDunne2, I still think you may appreciate the following ode:

No airline is an island entire of itself;
every carrier is a piece of the GDS (global distribution system), a part of the main;
if a clod be washed away by Expedia;
Europe and American is the less, as well as if a promintory were,
as well as any manner of thy codeshare partners or of thine own were;
any Sabre-rattle diminished me,
because I am involved in AAdvantage.
And therefore, never send to know for whom the bell tolls;
it tolls for Orbitz.