: Enter codes like C:LH+ to see only Lufthansa flights, or X:AMS to ensure a layover in Amsterdam.

The ITA Matrix is a web-based flight search engine developed by MIT scientists in 1996 and later acquired by Google in 2011. It actually serves as the underlying engine for Google Flights, Kayak, and Orbitz.

: You can enter multiple airport codes (e.g., "JFK, EWR, LGA") to compare all options in a metropolitan area simultaneously.