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Short answer: 006 is the three-digit airline code IATA assigned to Delta — it’s the first three digits of every genuine Delta e-ticket number, and it’s how Delta (and every other airline, agent, and system in the industry) confirms a ticket was actually issued by Delta rather than a partner airline or a travel agency. It sounds like trivia, but it matters more than most travelers realize when something goes wrong.
What the Number Actually Is
A Delta e-ticket number is 13 digits long. The first three — always 006 — identify Delta as the issuing carrier under the IATA numeric airline coding system. The remaining 10 digits form a unique document number for that specific ticket, ending in a check digit used to catch typos and prevent fraud. Every airline gets its own three-digit prefix: American is 001, Alaska is 027, and so on — 006 is Delta’s alone.
This is completely different from your confirmation number (sometimes called a PNR or record locator) — the 6-character code you use to check in or pull up your reservation online. The confirmation number identifies the booking; the ticket number identifies the ticket itself, and it’s the one that matters once you’re dealing with anything financial: refunds, credits, or airline-to-airline disputes.
Where to Find It
- Your email flight receipt from Delta — look for “Ticket Number” or “E-Ticket Number.”
- My Profile or your trip details on delta.com or the Fly Delta app.
- The Flight Receipt section of your booking confirmation email.
If you booked through a travel agency, an online travel agency (OTA), or by converting points from another program, don’t assume the ticket automatically starts with 006 — that’s exactly the scenario where it’s worth double-checking, and it’s the whole reason this three-digit prefix matters in the first place.
Why 006 Actually Matters
- Proving who ticketed your flight. If a Delta-marketed flight was actually sold and ticketed by a partner airline, your ticket number will not start with 006 – it will carry that airline own prefix instead. That distinction can affect which program benefits and fare rules apply to the trip.
- Getting missing miles or MQDs fixed. When you call about a missing or incorrect credit – including an Original Routing Credit request after an involuntary reroute – the agent works from your ticket number, not your confirmation code. Having the correct 13-digit number ready speeds up the call.
- Recovering a lost or corrupted booking. Confirmation codes can occasionally get mismatched between systems, especially on itineraries involving partner airlines. The ticket number is the more permanent record other systems rely on to locate your ticket.
- Confirming eligibility for changes and refunds. Fare rules, change fees, and refund eligibility are tied to the ticketing airline. A 006 ticket follows Delta own rules; a ticket issued by someone else may not.
The Bottom Line
Your Delta ticket number is the 13-digit string starting with 006 on your flight receipt – not the 6-character confirmation code you use to check in. Most of the time you will never need it. But when something goes wrong – a missed MQD credit, a rebooking dispute, a lost reservation – it is the number that gets your case resolved faster, especially if you booked through a travel agency, points transfer, or partner airline where a non-006 number can signal a different set of rules apply.
