Wolfram Alpha lets you spy on the flights overhead

It’s a bird, it’s a plane, it’s … okay so it’s just a plane. But wouldn’t it be cool to know everything about that aircraft overhead, like its altitude and where it’s headed? Computational search engine Wolfram Alpha now has the answers.
Wolfram Alpha is the sophisticated search engine capable of computing answers to factual questions; it’s especially handy for math and science queries. The startup launched with a bang in 2009 but wasn’t the Google-killer that some had predicted. The company’s technology is once again in the spotlight, since Siri, the iPhone 4S virtual assistant, relies on Wolfram Alpha for some of her answers.