[Posted in travel hacks, but reposting here so COPA users can easily find:]
If someone with status on Copa books a ticket for someone else, that person receives all benefits associated with purchasers status.
Including 3 free bags, upgrades, fee waivers, flight discounts etc. They literally walk over to you when you board and offer you a drink and thank you for being a COPA Gold member. (I’m assuming this also works for other tiers.)
This even works for Star Alliance partners, such as United. You can enter Star alliance lounges, not just Copa lounge. They print GOLD on your boarding pass as if the passenger has gold status, so there is no akward explaining to do.