At booking if the airline charges for the seat choice, I don't do it. I am not going to pay extra to choose my seat in Economy, ie to reserve a seat beforehand. Although I always book Economy, there just might be that slight chance of an upgrade., well, no such luck, minus the two exceptions with Lufthansa.
The result is that the booking is finished on-line without my knowing where my seat on that flight will be. I wait until check-in to pick my seat. I don't necessarily care for a window seat, there have been times I lucked out at check-in to get an isle seat in the back. I prefer sitting in the back.
This flight as well as the last two over is on Br Air, paid $500, dep the end of April from OAK to London Gatwick., no open jaw flight this time since this is a round trip ticket. The return is on 7 June, which means 39 days on the ground, Gatwick to OAK, both flights non-stop. I check in the spinner, the other piece the shoulder sack serves as the one piece of allowed carry-on.