The problem was that they misjudged the cost of being homeless. If you have a vehicle or belongings, being homeless is more expensive than people think. Another complication was their dog.
Lambert International airport is a world class airport. It has been downsized somewhat due to American Airlines moving its hub away from St. Louis. It still retains a strong employer presence in the region. Lambert International Airport employs personnel for ticket sales, passenger boarding, security, vending, luggage handling, maintenance, and a host of other jobs.