Why go through security again for connecting flight?

It's a security measure to stop anyone bypassing border controls by arriving with an international connecting ticket, then swapping documents with someone booked on to an internal (domestic) flight.



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Most (but again, not all) airports connect international terminals airside. When you're connecting from an international flight to a domestic one, you'll always have to exit and reenter security as you'll need to go through customs and immigration (unless you have gone through preclearance aboard, which is rare).

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Yes you will need to go through an X-ray and security check during a connecting flight because during a stopover, sometimes called layover, you can have time to exit the airport, buy something outside and then return to the airport, to make your connecting flight.

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However, the only time you have to get your checked bag and re-check it is when you have to go through customs and you have a connecting flight. You go through customs in the first country you land in.

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You will need to reclear TSA security once you arrive in your departure terminal. For international arriving passengers, you must claim all checked bags at Customs and recheck with your departing airline, even if the bags are checked to your final destination!

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Overall, passengers usually have to re-clear security for connecting flights, though there may be some exceptions depending on the airport and flight itinerary. To make this process easier, checking with the airline or airport ahead of time is recommended.

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Kennedy International Airport. If you're connecting with another airline, you may need to change terminals. If you're arriving on an international flight, you need to clear US Customs checkpoints before entering the United States and collect your baggage (even if you're in transit and have connecting flights).

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By default all connecting passengers have to go through security and plenty of airports do this for everyone regardless of where you come from (London (LHR), Paris (CDG), Doha (DOH), etc.)

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In most cases, if you have a connecting flight with the same airline or a partner airline, your checked-in luggage will be transferred automatically from one aircraft to the other. This is known as interlining or through check-in.

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Airlines will transfer your checked bags if a codeshare or interline agreement exists between them. You can find out what agreements your airline has by visiting their website.

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If you have checked baggage, you must recheck it between flights:
  1. Collect your checked baggage at the transfer airport. ...
  2. Leave the transit zone and take your baggage to the check-in counter (or baggage drop) for your next flight.
  3. Go through security and customs to the gate of your next flight.


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The recommended layover time for domestic flights is normally one hour. However, as previously stated, you may require longer if your flights are booked with two different airlines, if you are traveling to a very busy airport or if you require special assistance.

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If you miss your connecting flight, the airline will usually transfer your checked luggage to the next available flight. However, it is important to contact the airline as soon as possible so they can make sure that your bags are on their way.

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In most cases, you'll receive your boarding pass for your connecting flight already when you check in for your first flight. This means you don't have to check in again for your next flight. If you haven't received it, you can go to the transfer desk or kiosk of the airline you're flying with to collect it.

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A direct flight is identified by a unique flight number. A transit flight, with a connection, has two distinct flight numbers. A flight that is not direct, or connecting flight, involves a change of aircraft.

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Yes, there might be exceptions, but most often than not the airline won't wait. What you can do is to try to avoid missing your connection. But if you do miss your connection, don't worry, the airline will book you on a new flight for free (if it's an airline-protected connecting flight).

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It can take as little as 5 minutes or as long as 90 minutes depending on a multitude of factors as well as the motivation of the baggage runner. Airlines are aware of tight connections way before the plane hits the ground. Whenever possible, an expedite runner is sent to connect Shocons (short connections).

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Parcel shipping (UPS or FedEx) Like USPS, shipping your luggage through parcel carriers like UPS and FedEx enables you to ship your bags directly to your destination, whether they're headed for a hotel or a new home.

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You will need to go through passport control (and customs if applicable) and then check in again as normal for your connecting flight, so please ensure you have enough time.

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Give yourself a fighting chance
But the 45-minute rule only applies under ideal circumstances; if your connection takes you to a notoriously troublesome airport during the winter months (we're looking at you, Chicago O'Hare), try for a flight with at least a 75-minute layover.

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Airport guidelines also suggest a minimum of 45 minutes for international connections, but given the size of the airport, allowing 60-90 minutes would provide a more comfortable buffer.

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