Do you have to go through extra security for international flights?

Additional security measures for international flights to the U.S. The U.S. Department of Homeland Security (DHS) uses additional security measures for all international flights to the U.S. They include screening with questioning of some or all travelers, as well as extra screening of larger electronic devices.



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If you're flying internationally, you may need to go through a second security screening before your flight: immigration. All you'll need to do here is show your passport and follow the instructions from the immigration staff. This is the last step before you can walk to your gate for your flight.

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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.

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TSA doesn't publish specific guidelines on why certain passengers get SSSS markings on their boarding passes. Anecdotally, passengers with unusual travel patterns, one-way international flights and travelers to certain countries get it the most. It is also possible that TSA assigns SSSS markings randomly.

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Any airline passenger with the letters “SSSS” printed on their boarding pass have been selected for extra security screening by airport security. Used by the Transportation Security Administration (TSA), the letters SSSS stand for Secondary Security Screening Selection or Secondary Security Screening Selectee.

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Enroll in TSA PreCheck, Global Entry, or Clear to make your way through faster. With TSA PreCheck, you keep on your shoes, belt, and light jackets while going through security. Around 200 airlines participate in the program, as well as 85 airports, so if you travel often, it's worth the $70 to $80 annual fee.

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Travel advisers say there's a lot to take into account when booking connecting flights, but a general rule of thumb is 60-90 minutes between domestic flights and at least two to three hours for international itineraries.

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Everyone who boards an aircraft at Heathrow has to be security screened to UK government standards. Even if you've already been through security checks at another airport, we're obliged to screen you again before you fly from Heathrow.

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For international layover flights booked on one airline, two hours is often recommended to make your connection. For international flights on different airlines, the connection time will need to be even greater as you may have to change terminals between the two flights.

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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. Sometimes there will be more than a single stop.

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If your flights were booked under one ticket, your bags will be checked through to your final destination. If your flights were booked under separate tickets, you will need to collect your bags and recheck them before your connecting flight.

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What to Do After Online Check-In. Once you receive your electronic boarding pass, you can head straight to security if you're traveling carry-on only. If you're checking a bag, you'll still need to stop by the ticketing area at the airport. Look for special “bag drop” lines that bypass longer check-in lines.

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International Connections
If your connecting flight is in Terminals 1, 2 or 3, you can take the free, 24-hour Airport Transit System (ATS). All connecting passengers must go through Transportation Security Administration (TSA) security screening.

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The rule of thumb is that you leave AT LEAST 3 hours from arrival to departure for international flights and 1.5 hours for domestic. You still have to get your bags, clear customs, re-check your bags and then go through security for your next flight. All of this can take a couple of hours.

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Generally speaking, most airlines will make some kind of efforts to wait for delayed passengers on a connecting flight, though this is not necessarily guaranteed. In some cases, airlines may be able to hold a connecting flight for a period of time, but it is not something that is typically guaranteed by any airline.

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We recommend that you allow the following minimum connection times: 1 hour for connections within the same Heathrow terminal. 1 hour 30 minutes for connections that require travel between terminals at Heathrow.

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Priority security Fly to your gate faster with an expedited lane to the security checkpoint at select airports. Enjoy priority security automatically when you purchase a Blue Extra fare or an Even More Space seat-or add it separately. Just look for the extras section when booking your flight or checking in.

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Enroll in TSA PreCheck or Clear
TSA PreCheck is a trusted traveler program that allows those who are enrolled to go through an airport security line that is usually shorter and faster than the regular line.

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A Secondary Security Screening Selection or SSSS designation on your boarding pass means that you've been picked for a secondary security screening. The Transportation Security Administration (TSA) may select passengers for SSSS on flights from, to and within the U.S.

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Secondary Security Screening Selection — or The Quad S, as some call it — means you have been selected for additional enhanced security screening by the Transportation Security Administration and the Department of Homeland Security.

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An “A” or “F” mean first-class treatment, while a “B” often means you're more likely to get upgraded than if you have a “Q” or a “Y” on your ticket—the latter two are typically the cheapest economy fares.

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