Update: Still alive on March 19 (sample dates February 3 - 10) for $257 in Norwegian Krone.

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A few weeks ago, United's Danish website was way under-pricing First Class tickets from London to the United States, about $100 to anywhere you wanted to go. United said it would not honor those tickets, and I sided with United while noting that United States Department of Transportation (DoT) rules seemed clear that United couldn't unilaterally cancel its tickets.

Now the DoT has weighed in with a statement.

The statement makes clear that United will not have to honor the mistake fares.