Originally Posted by
canadiancow
Not open source because while it using an Amadeus API, it's not a public API. Even the public ones that I found aren't really public, they're just free. You still need an account.
Thankfully it's not very difficult to get an Amadeus API key - I have one that I'm using for a flight search program that will be FLOSS when it's ready and signup to get a key was super easy.