I am about to start using the API, I tested the sample request provided at the doc page:
http://flightxml.flightaware.com/json/FlightXML2/MetarEx?airport=KJFK&startTime=0&howMany=1&offset=0
I get the error Authentication Required however I am sending the basic auth params as indicated:
User: [my flightaware.com username]
Password: [my API key] - it has permissions for FlightXMLVersions: v3
Could you please advice?