The iPhone Apple Store app has been updated over-the-air today to offer a free iBook download to customers. The book is Away in My Airplane by Margaret Wise Brown. According to a note sent to Apple retail employees today, the free book download is meant for employees to have context when discussing and pushing the iBooks app and iBookstore to customers.

As we reported last month, Apple will be pushing free content to the Apple Store app in order to entice customers to download the app. Apple Store employees are also instructed to ask new iOS Device customers to install the app. In turn, if more people have the Apple Store app on their devices, Apple could sell them more products.

The new book offer expires on August 28th, and it is exclusive to the United States, United Kingdom, Italy, France, and Sweden, according to an Apple employee.

As part of a general iBooks push, Apple started providing its retail employees with free book titles in order to boost familiarity of the service.

The Apple Store app received its first free piece of content in the form of the Color Zen iPhone app earlier this month.