Orbitz seems to be based on the ITA engine. I've been using their beta version for about a year and it is a superior product. It shows the cities you connect in and permits (and prices) inputs for multiple passengers (icluding seniors) in classes of your choice.
Searching identical itinerares returns identical prices, but ITA provides more data.

You can sign on to use ITA at: http://www.itasoftware.com/