The letters are the airline code, or the numbers universally recognized to represent the name of the airline in shorthand. Some are obvious—AA is American Airlines, for example.
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The letters stand for Secondary Security Screening Selection and if they appear on your boarding pass, it means your name is on a highly classified roster - the Selectee List. Once they come to pass through security, they'll likely be subject to “enhanced” pat-downs while their luggage might be inspected by hand.
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.
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.
An SSSS code on your boarding pass might happen for a few specific reasons but it can also be the result of a completely random assignment. However, many of the main reasons someone is flagged for an additional screening may be connected to being a suspected security risk.
If the letter B, H, M or Y is on the boarding pass, then the traveller is in the most basic class. This stands for economy seats, revealing the passenger is sitting in some of the cheapest seats onboard.
On many aircraft, the rightmost seats have letter designations HJK, skipping the letter I. This is because each seat has a row number followed by letter; letters that may be confused with numbers (I, O, Q, S, or Z) must be avoided, usually for people with dyslexia.
The ICAO phonetic alphabet has assigned the 26 code words to the 26 letters of the English alphabet in alphabetical order: Alfa, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliett, Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu.
If SSSS appears on your boarding pass regularly, you can apply to the Department of Homeland Security (DHS) Traveler Redress Inquiry Program (TRIP). That program may remove you from whatever mysterious watch list you may be on — if you're not a security threat, that is.
The TSA largely looks for physical evidence that a passenger could be a threat, so they'll generally have no reason to search through the data on your phone. After all, they're the Transportation Security Agency, not a detective agency. Even if they did have reason to want to access your phone, they'd need a warrant.
F - First Class. G - Conditional Reservation. H - Economy/Coach Discounted – Usually an upgradable fare to Business. J - Business Class Premium. K - Economy/Coach Discounted.