All that is true: AA will reissue a paper ticket as an eticket, BA will reissue an AA ticket, CX will do the same, etc., but always for a reason, usually a rerouting. What I have never seen, however, is an airline reissuing on demand, for no reason other than the convenience of the passenger, and at no cost to boot. I am not saying they will not do it; I'm saying I have never heard of it.