http://www.harpercollins.com/books/Hot-Air-Henry/?isbn=9780688040680 or you check check it out from your public library.
This story is about a Cat named Henry. Henry wanted to fly but no one wanted to fly with a cat. A young boy who was taking pilot lessons and was about to go on his first solo flight in a balloon jumped out of the balloon basket to get his camera. Henry takes the opportunity to leap up to the basket and fly away.
When that sassy Siamese Henry stows away in a hot-air balloon and goes aloft alone, it is a fur-raising flight indeed. Followers of Henry's cross-country skiing adventure will be equally charmed by his mastery of the wild blue yonder.