QUOTE: As a result of an audit of tickets earlier this year, the company detected a sizeable number of transactions that involve violations of its tariff rules.” The prohibited practice is commonly referred to as “back-to-back ticketing.” Flight coupons across tickets are used in an order other than that in which they were issued. Ultimately, it results in a wrongful effort to obtain a discount to which the customer is not entitled.... END QUOTE

In light of this announcedment, I think that if a person is going to purchase back-to-back tickets, that he or she should do so only by purchasing the ticket set to be used for the outgoing flights through a different ticketing agency than what will be used for the returning flights. Also, the outgoing flights and the returning flights should be on different airlines which are not related through any codesharing arrangements or alliances.