What’s that in the sky? Is it a bird? Is it a plane? Yup, it’s a plane, and it is currently 31,100 feet high and traveling to St. Louis from Chicago. Simply enter “planes overhead”, and Wolfram|Alpha will provide a list of flights overhead based on your current geoIP location.
You can also click on specific flights to learn more information, such as departure airport, estimated flight duration, and more: