I have previously worked at Southwest Airlines HQ as a Customer Relations Supervisor, and when something as serious as booking $1000's of dollars of flights and flying or No-showing several to cover the one they were actually intent on flying the most we would do is issue a charge back and report to our internal fraud prevention dept which would simply add it as a data point to automatically cancel flights similar to this in the future. We would have the fraudster's full name, address, phone number, email, and sometimes their social for their ticket to be valid to get past TSA. Even with all this, nothing more than canceling a Rapid Rewards account or blacklisting their email was actually ever done to the thief.