First of all, in my experience, F seats become more available close to the time of the flight, so I make a reservation on something like UA, which is easy to get and then keep checking to make a change.

As for only one seat being available, when travelling with two, we found this to be the case, but realized it is more a case of the airline releasing one at a time, so we booked one, and waited until a second came available (a couple of weeks) and got two, or in one other case we booked the last one and while on the phone with aeroplan another was released. So we started with a confirmed UA itinerary to Japan in F, and ended up with a SQ / OZ itinerary in F (be prepared to pay some change fees, but it's worth it).

Also, as the previous poster has mentioned, the service on Asiana F is amazing, and in my experience much better than SQ. It is the SQ hard product that is nice, but I would do Asiana again in a flash - you will be pampered. SQ is good but our flight from LAX to NRT in F the service was a bit cold and uncaring - not so in Asiana!


Goodluck.