Do the Boston flights get booked up in UC at August time or just in the summer generally? Would I be ok to book the seats next month? Any help is appreciated 
It's all a gamble.
Book early and pay the full price, but bag your seat now that the new selection system is up and running.
Wait and see if there is a sale and maybe save some money but risk not getting the seat you want.
Sorry but there is no definitive answer.
Personally I book my flights the day my return is available.
Are you paying money or using miles?
Dick D


