Excited to be travelling to Chile on Thursday, I stayed up late to pre-select my seat on LA 5703 from Madrid to Santiago. Although I cant check in online, for security reasons, Lan advertise a "Pre-check in" which enables me to make a seat selection. Having spent hours navigating the site, I can find no way to select my seats. I can find many redundant pages, links which dont work and one which randomly sends me to a "Travel Voucher" page. It is a very long time since I have seen such a terrible web site, which is a poor indictment of a national airline. The telecomms set up is even worse (dead ends, redundant IVR options etc) I despair and am too tired to persevere any more! Can anyone tell me how to select my seat on LA 5703, or is this just more misinformation from Lan?