I always travel with e-ticket, and they are valid, anywhere. not a problem in US port of entry for US citizens, permanent residence/ h1b holder, even for student. but im worrying about those who are coming here in visiting visa. coz i know they have to show their return ticket at port of entry, then only the INS officer stamps stay duration in US. anyone, who has invited thier parents in US in visiting visa, came with e- both way-ticket, please share your experience. thanks.