If you'd like to delete your account, first log in to the site. Click on My FlightStats in the upper-right corner of the screen and then choose My Account. Towards the bottom of the page, in the Your Privacy section is a link to delete your account. Click on the link and confirm that you want to delete.
This will completely remove your information from our internal systems. If you are subscribed user and simply wanting to cancel your subscription, but not lose your log in, please see this FAQ: How do I cancel my subscription
We have a variety of products and sites. If you're referring to an account on a different website or tool, please submit a support ticket and we will promptly assist you.