Originally Posted by
747FC
Say a traveler has a one-way ticket on Airline 1 to Country A. When checking in for this flight, the agent asks for proof of onward travel. The passenger presents a printout showing either an airline ticket on Airline 2 departing Country A
An airline ticket from another carrier should be no problem. I've done this before. It's doubtful they'll even check to see if your confirmation is real. In years past, they'd want to see the actual paper ticket and not just an itinerary, but in today's world of electronic tickets, it's too much work to verify each one each time. The some holds true for the immigration authorities upon arrival. However, if the immigration authorities decided to verify your return flight and you got caught presenting a fake document, that would probably be Very Bad.