Finished Puzzle Size: 9 x 11 in. An Aerostat is the technical name for a Hot Air Balloon. Regardless of what you call them, their beauty and grace are fascinating to Eric. We are excited to introduce the latest addition to our Aerostat collection with Up, Up, and Away… This scene captures balloons aloft over the autumn colors of the Rocky Mountains – a new Rocky Mountain High. These bright colors against this beautiful scene is full of fun characters and puns in suspended animation. Upward and onward.