I hope you enjoy your trip. I wasn't trying to argue really, it's just that your original post was so generalized that it has or will probably scare a few people and cause them to panic, change their plans, or pay higher fares than is really necessary. It's extremely rare that any flight would be sold out more than 60 days out, and we're still 10 months away, so I question what the reservations people told you. It may be that they have only released a certain number of seats to sell for those flights at this time, but I don't know what you were specifically looking for. Therefore, any idea I can come up with is mere speculation, so I'll leave it at that.
I'm glad that you were able to find a flight that worked for you and your family, and like I said, I hope you enjoy your trip.