Mr. WikiHNL just had an email come in from Alaska saying he was double billed for the flight I booked for him on July 4th. I say "meh", mistakes happen, it was caught, and Alaska is taking measures to correct it.
I booked my July 7th flight the same day, about 20 minutes after I booked his, so I'll have to follow up to make sure both flights weren't double charged, or worse, they think one of the 2 was an error and is canceled, but I highly doubt that would happen.