I'd like to ask the following question

Obviously, upon travelling, we have to go to the check-in in order to get the boarding card/pass and then we have to clear immigration by going to the entry or exit immigration spots (I'm not considering customs). Do airlines generally share flight data with the immigration or does the latter only check the eligibility of the individual to enter the country, or does it depend on the country?

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    At least in the USA, they are required to (share information). – Aganju May 28 at 18:33
  • Not exactly the same question, but I believe that my answer also covers what you are asking here: travel.stackexchange.com/questions/163892/… – Tor-Einar Jarnbjo May 28 at 18:36
  • @Tor-Einar Jarnbjo Thanks firstly, but I have some further questions. I mean, it might be legit that destination country's authorities can request to receive flight data, but does this happen also for departure country's authorities? If the latter does happen, then any dual citizen willing to hide his nationalities from other countries might not succeed to do so. – abdul May 28 at 19:13
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    @abdul: the answer to your question as asked is "depends on the country: some do and some don't". If you want to know about hiding a second citizenship, you should ask a new question or edit your existing one. – Hilmar May 28 at 19:24
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    @abdul The departure country may receive this information (for example, the US and UK don't have exit checks, but rather receive departure information from the airlines electronically). If you have a specific question about trying to travel as a dual citizen while keeping one of your nationalities a secret, it's best to ask that directly, as there are specific strategies people use in that situation depending on the country concerned. – Zach Lipton May 28 at 19:25

It depends.

Traditionally, and this is still the case in many countries, no. Airlines used to just check requirements, and they didn’t transmit anything to anyone.

However, over the last couple of decades, this has changed a lot, and many counties require information from airlines either for incoming passengers or exiting passengers, or both.

This takes the form of API (advance passenger information), also known under a variety of different names in different places.

If an airline asks for your passport info before they let you check-in, it’s for the purpose of transferring it to either the destination or origin country.

Most notably:

  • all passengers going to the US (or even flying over the US) will be notified to the US. They will be checked against no-fly lists, and for those going to the US, their eligibility will be checked (valid ESTA or visa...). If you’re not eligible, you won’t be allowed to board.
  • all passengers leaving the US or the UK will be notified to the origin country. Neither has exit immigration checks, so that allows them to update records and notice overstays.

I believe the EU (or is it the Schengen area?) already has a similar system for incoming passengers. Other countries already have or plan to have the same.


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