AirLabs API is described as 'Real-Time Flight Status API and Global Aviation Database' and is an app in the Travel & Location category. There are more than 10 alternatives to AirLabs API for a variety of platforms, including Online / Web-based, Android, iPhone, Windows and Linux. The best alternative is Skyscanner, which is free. Other great apps like AirLabs API are Google Flights (Free), FlightRadar24 (Freemium), RadarBox (Free) and ADSBExchange (Free).
The world’s largest co-op of ADS-B/Mode S/MLAT feeders, and the world’s largest public source of unfiltered flight data. Access to worldwide flight tracking data for hobbyists, researchers, and journalists alike.
The OpenSky Network is a non-profit ADS-B exchange for sharing real time aircraft data broadcast over the airwaves. The network consists of thousands of sensors connected to the Internet by volunteers which collect ADS-B and Mode S broadcast data.
PlanePlotter receives and decodes live digital position reports from aircraft and plots them on a chart. You can see a radar-like display of all those aircraft around you broadcasting digital messages including ACARS, ADS-B and HFDL.