Overview The Business Problem Hong Kong Express Airways (HK Express) is a low-cost carrier providing affordable fares for scheduled air service in and out of Hong Kong since 2013. Connecting multiple destinations across Asia, the carrier introduced an online ticketing platform to enable its customers to conveniently search and book affordable fares. While digitization in the travel industry has made it convenient for customers to search and book last-minute airfares, attackers abuse online ticketing platforms to disrupt services at a significant financial loss to carriers. Following the initial release of its online ticketing platform, HK Express began identifying anomalies in its key business metrics. The carrier witnessed a sharp increase in the number of tickets reserved (but

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