First time poster - please be gentle
The pdf on the link has been extensively altered - and not with any great skill. I don't think it's malicious, but it covers some probable procedural inadequacies and some dodgy English. You can take apart the pdf in Adobe Acrobat and see the different layers of edits and add-ons yourself.
http://msnbcmedia.msn.com/i/MSNBC/Co...AirwayBill.pdf
UPDATE: Apparently I was mistaken and this 'layering' of scanned PDF documents is a result of enhancement features of many scanner's software and is not evidence of tampering. Apologies.