I purchased the most recent e-ticket in Thailand on Lufthansa from my travel agent in Pattaya, Thailand for a business class flight BKK to LEJ and return to BKK. The **Electronic Ticket** and itinerary were printed by travel agent (from web site/internet).
You have a Reservation Number on the ticket, I have changed flights 2 times already, just called Lufthansa gave them the Reservation Number and changed flights.
Have also purchased from UA (web site) for flights from LEJ to TPA. Also flights to from Asia ~ NRT to TPA all no problem.
I use e-tickets from Jet Blue and UA when I am home in US ~ no problem