Can online ticket purchases be made without online seat selection?

Hello, some flights purchased online do not allow seat selection online, and seat selection is done at check-in.

Part of it is ok, go to the airline’s official website to select seats online with the ticket number and airline reservation number, you can try it

All tickets do not need to select seats online. When you check in, you will be assigned a seat number. You will not lose your seat just because you did not select a seat.