Apologies for cross-posting:

I am flying in different places in Argentina, Chile, Bolivia and Peru using, throughout, e-tickets (single PNR) of diverse LAN companies. I was told that e-tickets are often met by astonishment at check-in, even in places as cosmopolitan as Buenos Aires. I this a founded rumour, and should I try to change the e-tickets into paper ones, or should I trust LAN and just stop worrying?