Online Booking Apps for Android, iPhone, iPad, BlackBerry
There are numerous apps that allow business travelers to book hotels, flights, cars, and other travel-related things. 
Here’s a quick rundown of six popular ones. Be sure to look at the iTunes store ratings, which will give you an idea of how well they work over time.
Company: Expedia
App: Expedia Hotels
Platform: iPhone and Android
Languages: English
iTunes store rating: 4 stars out of 5
The Expedia Hotels app allows travelers to search for and book a room at over 130,000 hotels worldwide. The app also includes FlightTrack, which follows flights and provides updates (such as delays, gate information, departure and arrival times) and maps in real time. The FlightBoard feature displays information similar to an arrivals and departures board at an airport.
Company: Expedia
App: Trip Assist
Platform: iPhone, iPad, and Android
Languages: English
iTunes store rating : 2.5 stars out of 5 (2 for current version)
Integrates with Expedia Hotels and allows travelers to book flights, hotels, cars, and activities, as well as to update travel plans. Includes free SMS and e-mail updates. Syncs with Expedia account and provides access to Seatguru.
Company: Kayak Software
App: Kayak Flight, Hotel Search and Kayak HD (iPad)
Platform: BlackBerry, iPhone, Android
Languages: 11 including English, French, and German
iTunes store rating : 3.5 stars out of 5 (current version 4.5 out of 5)
The Kayak app supports flight, hotel, and rental car booking. Kayak HD for iPad provides interactive maps for flight and hotel bookings. The Android and iOS versions include price alerts, flight tracking, and foreign currency conversion.
Company: Orbitz Worldwide
App: Orbitz Flights, Hotels, Cars
Platform: iPhone, iPad, Android
Languages: English
iTunes store rating : 3 stars out of 5
The Orbitz app allows travelers to book flights, hotels, and rental cars, track flights, view trips and use the phone’s GPS system to find nearby hotels (“Search Near Me” function). The Orbitz Hotels App for the iPad requires only three taps to book a hotel.
Company: Priceline
App: Hotel Negotiator
Platform: iPhone and Android
Languages: English
iTunes store rating : 3 stars out of 5 (current 3.5)
Travelers can “name your own price” using Priceline’s Hotel Negotiator app. Simply confirm the region or neighborhood, the level of hotel (using a star rating system), and the dates for the reservation and bid away. A separate app, Rental car negotiator, runs on the iPhone and works similarly. Hotel Radar displays hotels nearby.
Company: Travelocity.com
App: Travelocity
Platform: iPhone, Android, Windows Phone 7
Languages: English
iTunes store rating : 2 stars out of 5 (current version 3 out of 5)
In addition to searching and booking hotels and flights, the app displays local gas stations, traffic, weather, and driving directions. A “Top Secret Hotels” feature offers unnamed deeply discounted hotel reservations.
