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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F - First Class. G - Conditional Reservation. H - Economy/Coach Discounted – Usually an upgradable fare to Business. J - Business Class Premium.
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.
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.
You can find flight numbers on your boarding pass, flight ticket, or booking confirmation. One of the most direct ways to locate your flight is to see it near the top of your physical or digital ticket.
What Is “Secondary Security Screening Selection” (SSSS)? According to the TSA, any passenger with the four-letter code on their boarding pass can be swabbed for residue of illegal substances, such as drugs or explosives. Those passengers will also face additional questioning over travel plans and previous trips.
At a minimum, it identifies the passenger, the flight number, the date, and scheduled time for departure. A boarding pass may also indicate details of the perks a passenger is entitled to (e.g., lounge access, priority boarding) and is thus presented at the entrance of such facilities to show eligibility.
Second, at the bottom of each price box you can see the fare class currently available for booking, with Basic Economy coded as “N”. This is a wonky note and not something you'll usually need, but sometimes searching out your fare code is the only way to tell whether you've booked Basic Economy or not.