Answer :
The afterword of a book about the Wright brothers often provides reflection on the main content, discusses the historical impact of their achievements in aviation, and considers subsequent developments or new research related to the subject matter.
The purpose of the afterword in a book such as Into the Air, which details the exploits of the Wright brothers, is typically to reflect on the contents of the book, the implications of the subject matter, and the broader context of the Wright brothers' achievements. The afterword might provide additional information on the impact the Wright brothers had on aviation and subsequent technological developments. It may also explore how the historical events have been perceived over time and address any new research or findings that have emerged since the main body of the work was completed.