redfred
Bus ticket, concert ticket, train ticket etc cannot be replaced if you lost it for a very simple reason: it is not personalized and in most cases it is not stored into any kind of reservation/inventory system. So you can buy it, then make it "lost" and if you reissued then your friend/family/whoever can accompany you for free. But clearly it is not the case with airline tickets. If someone want to use stolen ticket he should have ID or passport with matching name and photo and pray that ticket is not cancelled yet.