Why another security control when transferring between flights?
The day before yesterday I had a flight from a non-Schengen country to a Schengen destination with transfer at Helsinki Airport. I was surprised to see that after arrival in Helsinki all passengers who wanted to transfer to another flight not only had to go through passport control - which seems understandable - but also through security control before getting to the departure gates. If you arrive by plane, you have had to go through security control at the airport where you started your journey, so why do you have to go through security control once more before you get on your second flight?
This matters especially when you have bought liquid goods at the original airport within security control area, meaning that you can take it with you in the plane, but at security control of the transfer airport it falls under the regulation for liquids (under 100 ml, separately packed and so on) for your second flight.
So what is the sense of this additional security control?
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Do I have to go through security again for connecting flight?
For connecting domestic flights, you almost never have to exit and reenter security, though there are some exceptions at airports where the terminals aren't all connected. For domestic-to-international connection, it's still pretty rare that you have to exit and reenter security, even if you're changing terminals.Do you need passport control for connecting flights?
In almost all cases, if your bags are checked through to your final destination and you already have your onward boarding pass, you'll go through transit security when you land at your connecting airport instead of customs.What happens in connecting flights?
A connecting flight is two or more subsequent flights. To put it simply, having a connecting flight means you will have to change planes. You will not be flying directly from A to B, but there will also be C. You will fly from A to C, and then from C to B.Can you go through security twice airport?
If you're asking if a TSA guard or police officer will escort you to and from your car allowing you to bypass security on your return the answer is no. But like others have pointed out, you are free to leave and re-enter as many times as you want as long as you're willing to go thru the TSA security line each time.Connecting Flights *Explained* - Backpacking For Beginners Ep. 5
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
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