I'm flying VX for the first time in a few weeks, DCA-SFO, and am looking forward to it.

I don't mind paying extra to select a seat ahead of time, especially a good seat. When I went to select a seat, I noticed that not very many are available for purchase. Do certain seats not open up until later, or does this mean most of the seats are already spoken for?

If Main Cabin Select doesn't have any seats for purchase, does that mean it is already fully booked?

I'll bne traveling with my wife - if we just decide to let them assign us a seat on the day of travel, will we almost certainly be in separate rows in middle seats?

Thanks for your help!