There exists a vast diversity of different pro travel online resources where a traveler can search for hotel listings and reviews in a certain area, flights in different airports and car rentals info along with other useful tips. However if you intend to get such data in the quickest way via your iPhone you are advised to appeal to Kayak for iPhone application. Its latest version features totally new and redesigned interface (the previous tile-like design was not very appreciated by users) with the innovative quick search system making it easier to build your travel plans.