Frequently Asked Questions > Immigration > Advance Passenger Information System (APIS) (technical questions)   Question: How would airlines know if there is any input error, omission or technical reason which results in the system not sending the advance passenger information to the Public Security Police Force? Answer: Advance passenger information can be transmitted a couple of times. In other words, there is no restriction that information can only be transmitted once. The enquiry function in the system allows service operators to check the information they have transmitted.   Previous Page

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