I bought an international ticket from the US to Asia on Priceline, via Vietnam Airlines, and I have a confirmation code from them. China Airlines is the carrier operating the flight and the one with the logo on the plane's tail, &c.
I'm trying to reserve a window or aisle seat on the plane. I have read that you can do so by calling the airline directly (search for "Time is the most important factor").
I called Vietnam Airlines to ask if I could reserve a seat, but they said I won't be able to do so until 24 hours before the flight (it seems unlikely any seats will be available). I called China Airlines, and they said they don't get the passenger information from Vietnam Airlines until 24 hours before the flight. It seems unlikely any window/aisle seats will be available 24 hours before take off.
Are there any options I'm missing for trying to select a seat, besides wait until just before the flight date?