Is it possible to make an app or widget that use info from the flightratar24.com app/website on smartphone? I'm thinking of something like the Sky Watch-app where you can point the watch to the sky an get info about a flight (flight number/altitude/speed/heading)? Is this possible?
Their web API is not open, and their apps don't talk to Garmin devices. Until one of those things changes it isn't something that you'd be able to tap into without violating their terms of use.