when to buy airfare??

We have another trip planned for November 2012!! We have vouchers from our trip in March 2011 from getting bumped off our flight.:cooldance: So we are going back to visit friends and for me to participate in the Wine and Dine Half marathon!!!:party:
My question is, I booked our trip last night using our vouchers for the kids and me b/c we HAD to...expiration date is tomorrow, but my dh will be joining us a week later so should I buy his ticket now or wait? I hate that the airfare is SO much more than last year-but gas prices are going wacko too, so since I don't have a crystal ball does anyone out there have advice on what to do? Buy or wait? :confused:
thanks!

For most of my trips, I book my airfare as soon as the dates are released. For my upcoming trip, I am traveling in July and I booked in December. If the prices drop, the airline will give a credit. The prices just seem to be rising so I don't expect a credit but it is nice to know just in case. Hope you have a nice vacation!:sunshine:

I book as soon as they are released usually too and already have my airfare for October. Booked it on 2/19 and it's already gone up 164.60 pp. I agree with the gas prices, I wouldn't take a chance on airfare going down.

Do all airlines give a credit if flights go down in price?