My little story:

Someone used my husband's cc to purchase two tickets from Canada to Houston. We only discovered this transaction when his statement arrived. The flights had not been taken yet, so I called the cc company and CO res and neither were interested in this fraud. However CO Corp Security was very interested. They locked down the PNR, refunded the money and told me that this transaction was very odd. When you make a cc booking, you have to provide the billing address- neither matched but yet the ticket became purchased. Corp Security also told me that this purchase was made by a Elite OP member in IAH and they would begin their investigation immediately into his account transactions. Busted.