Case Studies: Customer interactions in the Hospitality, Loyalty, and Travel & Entertainment industries are responsible for hundreds of millions of customer interactions annually. In 2004: Airlines in the United States carried nearly 630 million passengers on 9.6 million domestic flights The hotel and lodging industry sold nearly 1 billion room nights in the more than 47,000 properties that have at least 15 rooms. Over 51 million people are members of loyalty programs