To answer these questions, Harvard Business Review examined a database of 6.4 million flight bookings in 2014. We isolated data on how far in advance of flight women and men book their travel. Key takeaways: - On average, women buy two days earlier than men. Millennial women show the smallest difference in advance planning. - More travel means less advance booking in general; gender differences erode to virtually no difference for road warriors who travel more than 20 times a year. - The older any traveler gets, man or woman, the earlier they book, but women at every age group book earlier than men. Get the full story at Harvard Business Review