--- title: "How to use an Alaska (Atmos) upgrade certificate" description: "How to apply an Alaska upgrade certificate: which flights take one, how sharing works, what U class has to show, and why they never work on American." canonical: "https://2lnr.com/about/as/upgrade-certificates" url: "https://2lnr.com/about/as/upgrade-certificates.md" date_modified: "2026-09-08T00:00:00Z" --- # How to use an Alaska upgrade certificate An Alaska upgrade certificate is a Milestone Reward code that confirms a first-class seat on one Alaska or Hawaiian-operated flight when U-class inventory is open on it. Each code covers one-way travel for one person and is shareable, so the traveler using it does not need Atmos Rewards elite status. Reviewed September 8, 2026. Certificates are offered as choices once you clear a qualifying status point milestone. They are no longer granted by tier the way Mileage Plan's Gold Guest Upgrades (GGUs) were. Because they draw the same U-class pool as complimentary elite upgrades, a certificate confirms instantly where U class is open and does nothing where it is closed, so check availability before you apply one. On American Airlines-operated flights a certificate is not the instrument at all: Atmos status members get complimentary upgrades there instead. ## Earning upgrade certificates Upgrade certificates are available as milestone reward choices at certain status point thresholds within the Atmos Rewards elite qualification year. ### How Milestone Rewards work - At each status point milestone you reach, you choose from a set of reward options - Upgrade certificates are among the available choices alongside other benefits - Higher milestones may offer multiple certificates as a single choice - Certificates are deposited into your Atmos Rewards wallet upon selection ### What changed: Mileage Plan became Atmos Rewards The Alaska Airlines rewards program changes that followed the Hawaiian Airlines merger renamed Mileage Plan to Atmos Rewards and rebuilt how upgrade certificates are handed out. If you are searching for a benefit under its old name, this is the mapping: - **Gold Guest Upgrades (GGUs) became Milestone upgrade certificates.** The instrument still confirms one first-class seat on one Alaska or Hawaiian-operated flight against open U class, and it is still shareable. What changed is how you get it. - **Certificates are no longer a tier grant.** Under Mileage Plan they arrived with a tier. Under Atmos Rewards they are a choice you make at a status point milestone, so two members at the same tier can end the year holding different benefits. - **MVP tiers became Silver, Gold, Platinum and Titanium.** MVP Gold 75K sat where Platinum now sits, and Titanium is the tier above it. - **The American systemwide upgrade voucher is going away.** Alaska began sunsetting it in 2025, and Atmos status on American-operated flights is served by complimentary upgrades instead, with no certificate to apply. Milestone lists are still being revised year to year, so treat your Atmos Rewards account as the authority on what you actually hold. **Tip:** Upgrade certificates are generally the highest-value milestone reward choice for travelers who fly Alaska or Hawaiian frequently. A single certificate used on a premium route can be worth several hundred dollars in cabin differential. ## Using upgrade certificates Certificates provide a confirmed upgrade when U-class first-class inventory is available on the flight. ### Eligible flights - **Alaska-operated** North American routes - **Hawaiian-operated** North American routes - **Hawaiian-operated** select international routes with a first or business cabin, including Tokyo, Seoul, and Australia - Upgrade is to first class (main cabin to first) - Flight must have U-class inventory available at time of confirmation ### Sharing certificates - Certificates can be used by anyone, because the traveler does not need elite status - Share with family members, friends, or travel companions - Apply the certificate to the traveler's booking through the Atmos Rewards wallet ### Restrictions - North American routes (US, Canada, Mexico, Caribbean, Central America), plus the Hawaiian-operated international routes listed above - Partner-operated flights are not eligible - American Airlines-operated flights are not eligible either; see the note below - The upgrade confirms only if U-class first-class inventory is open ### Certificates and American Airlines There is no certificate to apply on American metal. Alaska's own Atmos Rewards page for American Airlines states that the complimentary upgrade benefit there requires "no upgrade certificates," and Alaska began sunsetting its American systemwide upgrade vouchers in 2025. What Atmos status members get on American-operated flights instead is a complimentary elite upgrade: - Open to every Atmos status tier, from Main Cabin or Premium Economy to the next class of service - Within the U.S. including Hawaii, and between the U.S. and Canada, Mexico, the Bahamas, the Caribbean, Bermuda and Central America - Confirmed as early as 72 hours before departure, in status order: Atmos Platinum and Titanium clear in the oneworld Emerald band, behind AAdvantage Concierge Key, Executive Platinum and Platinum Pro - One companion on the same reservation is included for Atmos Gold and above - Flights must be marketed and operated by Alaska or American, and American Basic Economy tickets purchased on or after May 18, 2026 are excluded ## Applying a certificate, step by step Five steps take you from a certificate sitting in your account to a confirmed first-class seat. The order matters: availability decides the outcome, so it comes before the certificate. 1 ### Find a flight with U class already open A certificate confirms only where U-class first-class inventory is open, so start with availability rather than with the certificate. In the [2LNR upgrade matrix](https://2lnr.com/app/upgrades), select Alaska Airlines and your route: each cell shows whether U-class space is open on that flight and date, with exact seat counts, so you can compare a month of departures at a glance. 2 ### Book the eligible flight Buy or hold a main cabin reservation on an Alaska-operated or Hawaiian-operated flight that qualifies. Each certificate code covers one-way travel for one person, so a round trip for two travelers needs four codes. 3 ### Open Manage reservation and choose Upgrade certificates Sign in on alaskaair.com or in the Alaska app, pull up the booking, and select Upgrade certificates from the Manage reservation menu. This is the only place the certificate is applied; 2LNR shows the inventory but cannot apply a certificate for you. 4 ### Pick a certificate or paste a shared code Certificates held in your Atmos Rewards account are listed automatically. To use one someone gave you, paste it into the Add certificates field: manually entered codes appear alongside your own, and the traveler on the booking does not need elite status. 5 ### Apply it and choose your seat Apply the certificate, then return to the reservation page to select your new seat. Where U class is open the upgrade confirms on the spot. On a multi-segment itinerary you can upgrade the segments that have space and stay on the complimentary upgrade waitlist for the rest. Click Update data on the flight right before you act so you are working from current inventory. **Hawaiian-operated international flights work differently:** a long-haul segment takes two certificates, and rather than confirming when you apply it, the request clears from a queue closer to departure. Treat those as a waitlist, not an instant confirm. ## Certificate strategy Certificates and complimentary upgrades use the same U-class inventory. The difference is who can use them and how they confirm. ### When to Use Certificates vs. Complimentary **Use a certificate when:** - The traveler is a non-elite, meaning companions, family, or friends who cannot get complimentary upgrades - You have lower-tier status and the flight may not clear in your upgrade window - You want guaranteed confirmation (when U-class is open) rather than waitlist **Save the certificate when:** - You're Platinum or Titanium with strong complimentary upgrade odds - The route is short-haul where the cabin differential is modest - U-class availability is high and your complimentary upgrade is likely to clear anyway ### Maximizing certificate value - **Target longer routes:** SEA-HNL, SEA-FLL, or transcontinental flights where first class has the biggest comfort advantage - **Monitor U-class with 2LNR:** Use the Alaska dashboard to identify flights with open first-class inventory before applying your certificate - **Time it right:** Apply certificates when you see U-class open rather than speculatively. This ensures the upgrade confirms immediately - **Share strategically:** Use certificates for non-elite companions on flights where you'll get a complimentary upgrade yourself ## How do I check whether upgrade space is available on my flight? An Alaska upgrade certificate clears into U inventory. Either U is open on your flight or it is not, and no amount of status changes that. 2LNR reads U space on 805 Alaska routes, 138,953 route-dates, re-checked continuously, so you see the answer by date before you attach a certificate. Seeing U open is not clearing: certificates confirm in status order from 72 hours out. ## Frequently asked questions **What is an Alaska upgrade certificate?** An Alaska upgrade certificate is a milestone-earned, shareable code that moves a paid ticket into first class on one Alaska or Hawaiian-operated flight, and it confirms only where U-class inventory is open on that flight and date. The traveler using it does not need Atmos Rewards elite status. **How do I earn Alaska Airlines upgrade certificates?** Upgrade certificates are one of the Milestone Reward choices in Atmos Rewards. When you reach a status point milestone during the qualification year, you pick a reward from that milestone's list, and upgrade certificates are typically among the most valuable options. The milestones and their reward lists are shown in your Atmos Rewards account. **How do you use an Alaska upgrade certificate?** Open the reservation on alaskaair.com or in the Alaska app, choose Upgrade certificates from the Manage reservation menu, pick a certificate from your Atmos Rewards account (or paste a shared code into the Add certificates field), then return to the reservation page to select your new seat. Each code covers one-way travel for one person. The certificate confirms only where U-class first-class inventory is open, so check U class in the [upgrade matrix](https://2lnr.com/app/upgrades) before you apply. On a multi-segment itinerary you can upgrade the segments with space and stay on the complimentary upgrade waitlist for the rest. **Can I give an Alaska upgrade certificate to someone else?** Yes. Alaska upgrade certificates are shareable. The person using the certificate does not need Atmos Rewards elite status. You can give certificates to family, friends, or travel companions for use on Alaska or Hawaiian-operated North American flights. **What flights can I use an Alaska upgrade certificate on?** Certificates are valid on Alaska-operated and Hawaiian-operated North American flights (US, Canada, Mexico, Caribbean, Central America). The flight must have U-class first-class inventory available for the certificate to confirm. Partner-operated flights are not eligible. **Do Alaska Gold Guest Upgrades (GGUs) work on American Airlines flights?** No. Alaska upgrade certificates, the codes Mileage Plan called Gold Guest Upgrades or GGUs, confirm only on Alaska and Hawaiian-operated flights, and cannot be applied to an American Airlines-operated flight. American is covered by a separate and different mechanism: Atmos Rewards status members receive complimentary elite upgrades on American-operated flights, which Alaska's own American Airlines status-benefits page says require 'no upgrade certificates.' Those complimentary upgrades are open to every Atmos status tier within the U.S. including Hawaii and between the U.S. and Canada, Mexico, the Bahamas, the Caribbean, Bermuda and Central America; they confirm as early as 72 hours before departure in status order, with Atmos Platinum and Titanium clearing in the oneworld Emerald band behind AAdvantage Concierge Key, Executive Platinum and Platinum Pro; and one companion on the same reservation is included for Atmos Gold and above. Alaska also began sunsetting its American systemwide upgrade vouchers in 2025, so there is no longer any Alaska certificate product for American flights. **How do I check whether U-class space is available on my Alaska flight?** U-class first-class inventory determines whether an upgrade certificate (or complimentary upgrade) can confirm. 2LNR monitors U-class availability in real time across Alaska's route network. Select Alaska Airlines in the upgrade matrix to see which flights have open first-class space. **What is the difference between a certificate upgrade and a complimentary upgrade?** Both use the same U-class first-class inventory. Complimentary upgrades are automatic and free for elite members, processed by tier priority within upgrade windows (48-120 hours before departure). Certificates are earned at milestones, can be shared with non-elites, and confirm when applied to flights with open U-class inventory. **What are Atmos Rewards upgrade certificates?** Atmos Rewards is Alaska's loyalty program, and its upgrade certificates are the milestone benefit that clears into first class out of U-class inventory. The certificate is the same instrument whether you call it an Alaska or an Atmos upgrade certificate. ## Sources - [Atmos Rewards: upgrades FAQ](https://www.alaskaair.com/atmosrewards/content/faq/upgrades) The program's own answers on how certificates and complimentary upgrades clear. (accessed July 24, 2026) - [Atmos Rewards: complimentary upgrades](https://www.alaskaair.com/atmosrewards/content/benefits/complimentary-upgrades) The benefit page for complimentary elite upgrades, the same U-class pool certificates draw from. (accessed July 24, 2026) - [Atmos Rewards: status benefits on American Airlines](https://www.alaskaair.com/atmosrewards/content/partners/airlines/american-airlines/status-benefits) Alaska's own page for the American Airlines benefit, and the source for the certificate answer above: eligible markets, the 72-hour confirmation, the status-priority order on American metal, the companion rule for Gold and above, the May 18, 2026 Basic Economy exclusion, and the notice sunsetting American systemwide upgrade vouchers with "no upgrade certificates required." (accessed July 31, 2026) - [Alaska Airlines: guest upgrades and upgrade certificates](https://www.alaskaair.com/content/mileage-plan/membership-benefits/guest-upgrades) The redemption steps used above: the Manage reservation menu, the Add certificates field, U class of service, and the per-segment waitlist behavior. (accessed July 31, 2026) - [Hawaiian Airlines: apply for an upgrade with Atmos Rewards](https://www.hawaiianairlines.com/content/huakai/upgrade-certificate) The Hawaiian-operated side of certificate redemption, including the international routes with a first or business cabin. (accessed July 31, 2026) - [Alaska Airlines newsroom: Atmos Rewards 2026 announcement](https://news.alaskaair.com/loyalty/atmos-rewards-2026-expanded-status-earning-bew-partnerships-and-exclusive-perks-announced/) Alaska's own announcement of the 2026 program changes. (accessed July 24, 2026) - [One Mile at a Time: Atmos Rewards Milestone Rewards](https://onemileatatime.com/guides/atmos-rewards-milestone-perks/) Coverage of the milestone reward choices and where upgrade certificates appear in them. (accessed July 24, 2026) - [Frequent Miler: Atmos Rewards complete guide](https://frequentmiler.com/alaska-atmos-rewards-complete-guide/) Independent 2026 coverage of certificate redemption on Hawaiian-operated long-haul flights, including the two-certificate requirement and the queue-based clearing. (accessed July 31, 2026) Milestone lists change from year to year. Check your Atmos Rewards account for the certificates you actually hold. ## Related [Alaska upgrades overview — All upgrade types on Alaska Airlines.](https://2lnr.com/about/as/upgrades.md) [Alaska upgrade strategy — Which flights to target, when to spend a certificate, and what MVP Gold 75K became.](https://2lnr.com/guides/alaska-upgrades.md) [Delta GUCs — Delta's Global Upgrade Certificates for comparison.](https://2lnr.com/about/dl/global-upgrade-certificates.md) [Alaska award availability — Award seats rather than certificate space, by cabin and date.](https://2lnr.com/awards/as.md) [2LNR vs ExpertFlyer — How 2LNR compares for upgrade and award search.](https://2lnr.com/compare/expertflyer.md) ## Monitor Alaska upgrade availability Track first-class inventory on Alaska Airlines in real time. Know when to use your certificate. [Get started free](https://2lnr.com/login)