What protects airlines (if anything) from fraud charges when they sell same ticket to multiple people for a single flight? (law.stackexchange.com)
Basically, they just buy the exact same tickets you can buy with no problem from the train station in Russia for about half the price. (trainsonthebrain.com)
Changing an award ticket: no fee as long as the origin, destination, and ticket type (economy, etc) remain the same (themilesgenie.com)