JO used to PERSONALLY frequent several forums, He would even debate things with people. I wouldn't rule it out, like somebody said, few airline mangers are actually managing their airline...they must be doing SOMETHING with their time.

If you're concerned, change your use name to something which does not give you away, and be careful giving up personal details (seat, domicile, hometown, previous profession/employer).

But if someone goes so far as to sue you, they can probably figure out who you...even if the website host does not have your real name, they have the IP addresses you use. If you use a permanent connection (like a cable modem) at home, they can easily find out who owns that. If you only use free wifi in public places, you are probably safe (a cell-based wireless system might be trackable via billing records). The crew room wireless is probably not safe...they could match your posting history with your reserve or duty schedule.

Just some thoughts, your actual level of paranoia may vary based on who you work for and what kind of poster you are.