I don’t think that this is what Twitter mean. Twitter mean that your account got tweets where the sender thought they were mentioning the airport. When you reply in a way that clearly impersonates the airport, you have broken the impersonation rules. It sucks, but I can see why Twitter have the impersonation rule. Had you done it once, or had you clearly stated that you’re not that JFK in the tweet, I could see that you have a case. The problem is: you did it repeatedly, and it can easily be perceived as intentionally misleading users. The fact that you’ve been on the platform so long is to me more damning: you should be aware of the rules after that time.