Continental Airlines, Inc. (Continental) (plaintiff) published discount coupons in 1991 and 1992. These coupons were for various discounts on airfare and stated that they could not be sold. Intra Brokers, Inc. (Intra) (defendant) obtained the coupons and sold them to travel agents. Continental repeatedly assured Intra that the restriction would not be enforced. However, Continental changed its position in April 1992 and informed Intra that the tickets could no longer be sold. Intra refused to comply with Continental’s policy. Continental then sued Intra, seeking an injunction against Intra in order to prohibit further sales of the coupons. The trial court granted the injunction, and Intra appealed to the United States Court of Appeals for the Ninth Circuit.