As airline delays affected thousands of travelers this week, some companies used the crisis to leverage products and services that could ease the plights of the stranded travelers.

Airlines waived fees and provided hotel vouchers, while a number of hotels, restaurants, tourist organizations, and cultural institutions offered discounts to people stuck on either side of the Atlantic.

While promoting a company's product or service during an international crisis is often criticized as in poor taste, the lengthy travel delays are different and, ...