https://www.alaskaair.com/content/mi...guest-upgrades
"Guest upgrades
Guest upgrades are electronic upgrade codes given to MVP® Gold members to upgrade friends or family members who are not traveling with them, or for their own use for immediate upgrade when not purchasing a qualifying fare. "
and rules:
"Guest upgrades are valid on Alaska Airlines flight numbers 001 - 2999, 3300-3499.
Flights must be marketed and ticketed by Alaska Airlines
Guest upgrades are booked into "U" class of service and are subject to availability as "U" class may not be available on all flights.
Not all flights have a First Class cabin.
"U" class must be available at the time of the request, as guest upgrades may not utilize the upgrade waitlist. When purchasing, choose a flight with a First Class upgrade available icon next to it. The First Class upgrade available icon is a dark blue square box with a white F. The First Class upgrade not available icon is a white box with a dark blue outline and dark blue F
Tickets purchased in G, T, R, or X classes of service are not eligible for guest upgrades (please select "MVP® Gold guest" from the "Upgrade type" list when shopping at alaskaair.com/planbook to view eligible fares for your itinerary. You can also select "MVP® Gold guest upgrade" in the filter results on the "Available flights" page.)
MVP® Gold guest upgrades are not available when traveling on an award ticket, including the Money & Miles award.
Each guest upgrade code is valid for one-way travel for one person. Connecting flights must have no more than a 4-hour stopover between them.
Guest upgrades may not be used as a placeholder for a complimentary upgrade by an elite level member. Once a guest upgrade has been processed, you may not remove it in order to be placed on the upgrade waitlist, or receive a complimentary upgrade based on elite level.
Guest upgrades are transferable but may not be bartered, bought, sold.
If a flight upgraded with a guest upgrade is changed or canceled, the upgrade is forfeited. A replacement guest upgrade code can be requested through customer care only by the MVP® Gold to whom it was originally issued.
Passengers traveling on an upgraded ticket do not have complimentary access to the Alaska Airlines airport lounges."