Bing

By Wendy Boswell, About.com Guide

Bing's Instant Answers feature quickly grabs all the pertinent information that you need on your query. In this screenshot, you can see a quick flight status search; all you need is the flight number and you're good to go.

This Instant Answers feature is pretty much the same as Ask's Smart Answers; you get your answer within your search results without having to click any further (cuts down on unnecessary search time).