How to Read Your Boarding Pass (Every Code Explained)

Every boarding pass (paper, mobile, or PDF) follows the International Air Transport Association standard. That means the same fields appear on every airline's version, though the layout differs. Here is what every field means:

The Group or Zone field determines when you board, and it is tied to your fare class and loyalty status, not your seat. Each airline uses its own scheme, and the numbering does not standardise. What Group 1 means on American is not what Zone 1 means on Delta.

The 2026 US airline breakdown:

A low group number is not just about convenience. It gives you first access to overhead bin space, which matters most on flights that are close to full.

• American Airlines: Groups 1 through 9. Group 1 is ConciergeKey and Flagship First. Groups 2-4 are elite tiers and premium cabins. Groups 5-6 are main cabin. Group 9 is Basic Economy.
• Delta: Zones 1 through 8. Zone 1 is Delta One, Diamond Medallion, and Global Services. Zone 8 is Basic Economy.
• United: Groups 1 through 6, plus Pre-Board for wheelchairs and unaccompanied minors. Group 6 is Basic Economy.
• Southwest: A, B, or C, each with numbers 1-60. Southwest has no assigned seats. Your boarding position is determined by check-in time and status.
• JetBlue: Even More Speed (paid), Mint (business), Mosaic (elite), then Groups A-E for main cabin.
• Alaska Airlines: Groups A-E. Main cabin typically boards in Group C. Basic economy (Saver) is Group E.
• Frontier and Allegiant: Zones 1-4 (Frontier) or numbered groups (Allegiant), with priority boarding sold as an add-on.

The single letter under Class or Fare is the most information-dense field on your boarding pass, and almost nobody reads it. It identifies the specific fare bucket you paid for, which controls how much you can change your ticket, whether you can upgrade, how many frequent-flyer miles you earn, and what happens if the flight is oversold.

The general standard across US legacy carriers:

The practical use. When you get a boarding pass with a Y or B fare class, you often qualify for a complimentary upgrade to a higher cabin if space is available. Deeply discounted classes (Q, S, T, N, V, W on most carriers) rarely upgrade. If your goal is a bump to business class, check the fare class before you buy.

• Y: Full-fare economy. Most expensive and most flexible. Rarely booked by leisure travellers.
• B, H, K, L, M, N, Q, S, T, U, V, W: Discounted economy fare buckets. Each airline uses these differently, but the general pattern is that letters earlier in the alphabet are more expensive and more flexible; letters later are cheaper and more restrictive.
• E on American, X on Delta, N on United: Basic Economy on that specific carrier.
• W, S, P: Premium Economy on most carriers.
• C, D, I, J, R, Z: Business Class or Delta One or United Polaris.
• F, A: First Class on carriers that still offer it (mostly Delta, American on domestic transcon, and a few international routes).

The TSA PRE mark on your boarding pass grants you expedited security screening (keep shoes on, laptop in the bag, shorter line). It only appears if your Known Traveler Number (KTN) is on the reservation.

The most common reasons the TSA PRE mark is missing:

CLEAR does not appear on the boarding pass. CLEAR runs its own identity verification at the airport itself, so the mark is not on the pass. For the full comparison of when to get TSA PreCheck, Global Entry, or CLEAR, see our companion guide.

• Your KTN was not added to the booking. Log into the airline's site, find the reservation, add your KTN, and re-download the boarding pass.
• The KTN on the booking does not match the Secure Flight profile exactly. Names must match your government ID.
• You received an SSSS designation, which overrides PreCheck for that itinerary.
• You are flying an airline that does not participate in TSA PreCheck (rare in 2026, but a few small operators still do not).

SSSS stands for Secondary Security Screening Selection. If it appears on your boarding pass, TSA's Secure Flight system has flagged you for enhanced security screening.

What actually happens:

Why you got it:

What to do. Arrive at least 3 hours before departure. Do not check in online. Head straight to the airline counter, then to security with time to spare. See our guide on REAL ID and domestic flying for the ID rules that apply at the counter check-in.

If you get SSSS on multiple consecutive trips, apply for TSA's Redress Number at dhs.gov/tricredress. It does not guarantee removal from the Secure Flight watchlist, but it flags you as a resolved case and reduces false-positive matches on future flights.

• You cannot use online check-in or self-service kiosks. Only the airline counter can print an SSSS boarding pass.
• At security, a TSA officer directs you to a separate area. Expect a pat-down, a physical luggage inspection, and a swab test for explosive residue.
• The extra screening adds 15 to 45 minutes to your security time. Sometimes more at busy airports.
• TSA PreCheck does not exempt you from SSSS. If you are flagged, your PreCheck status is overridden for that itinerary.
• The screening happens at both departure and at any connecting US airport.
• Random selection. The most common reason. TSA's system chooses a percentage of passengers randomly, regardless of profile.
• Last-minute booking. Tickets purchased within 24 hours of departure are flagged more often.
• One-way international ticket, especially paid in cash.
• Flying to or from a country flagged by the State Department.
• Name match to a watch list, including partial matches to common names.

Your frequent flyer number should appear on every boarding pass for a flight on a carrier where you have an account. Usually printed near your name or at the bottom of the pass.

If it is missing, the flight is not being credited to your loyalty account. This is more common than it should be, especially when:

The fix. Log into the airline's website, find the reservation, and add your frequent flyer number. Re-download the boarding pass. If the flight has already happened, most airlines let you claim missing miles by submitting the boarding pass image and flight details within 6 to 12 months.

• You booked through an OTA (Expedia, Priceline) and did not add your frequent flyer number in the booking flow.
• You booked before you had an account and never updated the reservation.
• The airline's system did not match your name in the booking to your loyalty profile (usually because of a middle-initial or suffix mismatch).