Priority Pass is a membership program focused on airport lounge access and other airport experiences. It is useful because it is not generally tied to one airline or a business-class ticket.
A member can access participating locations when the membership and lounge terms allow it. The membership currently offers access to more than 1,900 airport lounges and travel experiences across 856 airports in 143 countries.
However, the lounges and services available to you depend on your airport, terminal, membership plan, and individual lounge policies.
This makes Priority Pass useful for travelers who fly with different airlines. Instead of choosing an airline because it has a particular lounge network, you can check whether a participating Priority Pass location is available at the airport you are using.