When I filled out an E-Ticket for a friend of mine, all the customs questions were part of the E-Ticket. He. and several others here, said that customs just asked to see the E-Ticket code - no additional paper customs form needed(?).I flew in from Madrid yesterday it took me 10 min to go through immigration. Fifty++ people in front of me didn't have the e-ticket were turned back to fill in the paperform. I never had any issues with this "e-ticket". I do it on a laptop or desktop and print a pdf file I email to myself and pick up on my phone (in case someone want to scan it). I suggest Aduana do the same with the custom form. Get rid of all paper docs.