Don't know how you managed that! When you check the "use miles" box starting a reservation the box for the code disappears.Maybe I am misreading the second part, but we used a companion fare, miles and a full price ticket for my family and I (3 of us) to fly to Mexico last year. We use that method on all trips, as long as the companion fare has obviously not been used yet in the calendar year we are travelling. They allow using miles, companion, etc. together.