US Airways has a nice reservation system

For what it's worth, I am booking some vacation travel between two cities that US Airways serves, so I am booking through them instead of American, which doesn't have direct flights.  They have done a nice job with the reservation system, reducing the headache of selecting flights and checking fares.  When they display possible flights, they show you the departure and return flight possibilities in two columns and have a button to let you check the price on the combination you select.  If you are price-sensitive and time-flexible, they let you know about cheaper alternates.