All of flightcircle.com uses RSA encryption via SHA-256 SSL (Secure Sockets Layer). Much like a banking website you might visit, your browser will indicate this typically with a green lock at the upper left near the browser URL.
For credit cards processing, we do not store full card numbers, only the last 4. We use a token based system, much like Apple Pay.
We are PCI compliant, and PCI compliance is required by anyone who takes card (industry wide). When you use our card processing, annual assessment/training is provided. You can verify our certification at the following link: