The text, as I mentioned, is clearly aimed at children older than two. I am very pleased with the text; it is clear and simple but it doesn't talk down to young readers. It gives interesting tidbits of information about the various aircraft and explains the basics of how airplanes fly.
Although each letter is prominantly featured in both upper and lower case, the focus of the book is really not the alphabet. The alphabet forms a backdrop and theme for the gorgeous illustrations of airplanes. The realism and minute detail make this a book older children, who already know the alphabet, would like to possess. In fact, I know quite a few adult aviation fans who would love to receive this as a holiday gift! My son easily spends a half an hour to forty-five minutes just looking at the pictures--a VERY high compliment from any two-year-old.
I highly recommend this book for anyone who loves airplanes. It would not be my first choice for teaching my son the alphabet, but he is certainly learning to love books and to love airplanes!