Google has improved its search results for flight tracking. Previously, when you searched for an airline and flight number in Google (for example, AA 28), you got links to services that would tell you if your plane was on time or not. Now, you don't need the link: you get that data on the search result page.
This is a time-saver for Google users, but Travelocity, Expedia, and FBOWeb, which offer flight tracking services, will suffer since they no longer get the links. Instead, the data is provided by Conducive Technology's FlightStats. It's a decent service, but personally I prefer FBOWeb's tracker, because it creates cool links to track flights on Google Earth.
See my previous--and now obsolete--story, Map your sweetie's progress with a flight tracker.
Source: The Official Google Blog.