If you are sharing data either by using your own Raspberry Pi built receiver or FR24 provided, you are entitled to a complimentary business subscription for as long as you continue to share data.
If you already have an account, it will automatically be upgraded to business as soon as we start receiving data from your feed. If you don't have an account yet, simply sign up for a BASIC account and it will get upgraded to business itself.
https://www.flightradar24.com/premium/signup
DO NOT START A TRIAL BUSINESS SUBSCRIPTION. IF YOU DO, YOU WILL GET CHARGED AT THE END OF THE TRIAL PERIOD