Travelers from cities affected by this year’s cold front, including New York, Chicago and Boston, are fueling a surge in bookings to warmer destinations, said Jamie Lane, the chief economist and senior vice president of analytics at AirDNA, a short-term rental data analytics firm. Short-term rentals in Sarasota, Florida, and Punta Cana in the Dominican Republic saw a 31% jump in December and January, compared with a year earlier, according to AirDNA data.