Even back in pre-historic days (or at least pre-iPhone), travel industry companies like Zagat, Hilton and Amtrak used platforms like Usablenet to serve their content on feature phones.
But of course in the smartphone era, the method and style of user interaction is improved by orders of magnitude and whether it be via apps or the mobile web.
Now anything that could be done on the web can be done on mobile providing better customer engagement and enabling mobile commerce.
Read full story at: http://www.tnooz.com/2013/09/03/news/listen-up-there-is-a-major-job-still-to-be-done-in-mobile-travel/