I'd like to book frequent flyer tickets for Thanksgiving and Winter breaks. I know that I should book for after the last afternoon classes. What time would be a safe bet, assuming DS has latest afternoon class and then needs travel time to airport? Also, if he wants to be on offshore sailing team, are there usually events over the breaks that would prevent us from making early reservations? If so, we'll wait on the tickets, but we may miss out on the freebies.