Considering that you supplied Administrative Services to the company rather than services for a particular aircraft, are you legally allowed to place a lien on an aircraft?
BTW, my limited understanding of internet scams is that the scammer seeks to obtain your bank account details, after that they somehow transfer funds from your account. All of the required details for such a scammer are available in the documents that you have posted on aeroliens! You might consider editing out the details
Mutt