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Easily book flights found on ITA Matrix (the world’s most powerful flights search tool) using BookWithMatrix (https://bookwithmatrix.com)! Now, instead of having to retype all of your details in another flight search engine, you can get to the booking page with just the press of a button.
To use the extension, navigate to an ITA Matrix results page. The icon should become not grayed out, and you can click it to take yourself straight to BookWithMatrix.