You won't have access to lounge or other PLT benefits.
However if you're signed in right now - before hitting 'book' you should be able to select your seats on your reservation before you do. Is it a paper or electronic voucher?
EDIT: Missed the 'basic' part of the question - NO seat selection. Just book regular economy.
Last edited by fotoflyer88; Oct 2, 2019 at 8:47 am