The giant online ebookstore Kobo is now offering Flight Emergency for sale as an ebook in epub format. In addition to using one of their e-readers, you may use their free PC desktop application or their smartphone or tablet app. Thanks to their cloud-based service, ebooks you buy from Kobo can be read on any open device. (Amazon’s Kindle has its own proprietary file format.)
You can also find the ebook on Amazon for Kindle and Barnes&Noble for Nook. Coming soon: Apple’s iBookstore.