According to a Travel and Tour World article, extreme heat is leading to new travel patterns in major US cities, including Phoenix, New York, and Los Angeles. The article reports that as temperatures rise, tourists are seeking out cooler destinations, leading to a decline in tourism in some areas. In Phoenix, for example, the number of visitors dropped by 4% in 2019 due to record-breaking heat. New York and Los Angeles, on the other hand, are experiencing an increase in tourism as travelers seek out cooler climates. The article also notes that cities are facing challenges in adapting to these new travel patterns, including the need to provide cooling infrastructure and services for visitors.