If you know a lot about your particular speciality within the Aviation industry and you have earned some sort of income from that expertise, you are by definition a professional and therefore  eligible for consideration to be an AirSide Expert.

 You application will benefit from having other profiles across the internet which help us and your clients verify your expertise and authenticity. LinkedIn is especially useful in this regard so, if you don't have a LinkedIn profile yet then it's certainly a good idea to do one at the same time as applying to be an AirSide Expert.