There is a technical term for what you are doing: back-to-back ticketing. There is nothing wrong from an immigration point of view, except that you may get more questions.
However, there are airlines that don’t exactly like this. The practice is listed under “booking ploys” on Wikipedia. Some airlines, such as American Airlines prohibit this practice. But there are few reports of travellers who were asked for a surcharge after they have been “caught”.
This is quite normal, I often structure my itineraries like this, or even in more complicated ways such as four or five ticket deep nesting. You should have the details of the other ticket to hand in case you need it, but I have never found anyone who questioned me about it.
I don’t actually believe that the immigration people get access to the ticket information unless you provide it to them.
The only problems I can see with this are:
Each time you check in for your flight from London to Australia, the airline agent will not see your return itinerary right away, and might ask when and how you plan to leave Australia. If this happens, you’ll need to show the other booking. This could happen on both flights.
Each time you enter Australia, the immigration officer will see the details of the ticket you are currently travelling on, and won’t see your return itinerary (or it will appear to be much farther away than your allowed 3 months stay). You may be asked the same questions, about when and how you plan to leave Australia, and again will need to show the other booking.
Credit:stackoverflow.com‘
4 Mar, 2024
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