Hacker fares are wrong – but not as wrong as this

Passengers are breaking fare rules to save money. Are they breaking the law?

Would you break a rule for a cheaper airline ticket?

Susan Stevens did when she booked a hacker fare from Vienna to Frankfurt. A round-trip ticket costs hundreds of dollars less than a one-way ticket. So she bought a round-trip fare.

"After I landed, I threw the return ticket away," recalls Stevens, a retired publicist from Philadelphia. 

What rule did she…