The airline tickets can easily be exchange for cash, so don't think that sending tickets buys you any protection.
As you can see from my CV, I have taken my degree in Sports Science and concentrated on the study of child health and fitness.
I am currently a part time youth leader with the Craic Club, a non-profit organisation that aims to give young people somewhere to study, take part in sports and socialise after school hours.
And then send for Mikhail, her boyfriend/husband, who's been waiting back in Russia.
There's presumably no way you can guard against this - anyone who is patient can perpetuate this scam anywhere.
Generally, you want to provide the last name of the author and the specific page numbers of the source.