Introduction to Pressure - Force & Area, Units, Atmospheric Gases, Elevation & Boiling Point

Southwest Airlines, which used to let passengers choose seats at boarding, has announced several changes in recent months, including assigned seats and new fees for checked bags. Because of that, they are changing the interiors of their planes to accommodate the new seating plans and give travelers more overhead bin space. CBS News Senior Transportation correspondent Kris Van Cleave got a first look at a new Southwest plane — here’s what has changed.