We made this lapbook from http://www.homeschoolshare.com/hot_air.php and added a few of our own ideas.
Our library had a few children’s books about hot air balloons. These two were our favorites.
Here is a link to a cute craft idea we tried, of course we had to use batman action figures in the basket instead of the child picture http://www.dltk-holidays.com/summer/mballoon.html
We thought this video from the Albuquerque Balloon Fiesta was fascinating!