Deltahater

This is unfortunately old information. The DOT suspended its own rule and replaced it with a temporary one. The temporary says, in a nutshell,:

Airlines can cancel mistake fares and not face enforcement. However, if consumer has bought non-refundable positioning flights or hotels etc, the airline has to reimburse the consumer for that. Obviously that only applies to PNRs with US segments

This has been in effect since May 2015.

As a matter of prosecutorial discretion, the Enforcement Office will not enforce the requirement of section 399.88 with regard to mistaken fares occurring on or after the date of this notice so long as the airline or seller of air transportation: (1) demonstrates that the fare was a mistaken fare4 ; and (2) reimburses all consumers who purchased a mistaken fare ticket for any reasonable, actual, and verifiable out-of-pocket expenses that were made in reliance upon the ticket purchase, in addition to refunding the purchase price of the ticket. These expenses include, but are not limited to, non-refundable hotel reservations, destination tour packages or activities, cancellation fees for non-refundable connecting air travel and visa or other international travel fees. The airline may ask the consumer requesting out-of-pocket expenses to provide evidence (i.e. receipts or proof of cancellations) of actual costs incurred by the consumer. In essence, the airline or seller of air transportation is required to make the consumer “whole” by restoring the consumer to the position he or she was in prior to the purchase of the mistaken fare. The enforcement policy outlined in this notice is temporary and will remain in effect only until the Department issues a final rule that specifically addresses mistaken fares.