Priority Pass is a worldwide network of lounges, restaurants and suites available to members while traveling through their 600+ affiliate airports. With over 1,300 airport lounge locations (as of this writing), there is a large number of domestic and international airports that have one or several Priority Pass lounges.
Lounge amenities vary widely but can include free refreshments, shower access and dedicated work areas. Membership can be purchased directly from Priority Pass for as little as $99 (with additional fees for each visit), but it's also commonly included as a Priority Pass Select membership with credit cards that offer lounge access and, with those, will not require fees for each visit.
Once enrolled, members can present their Priority Pass membership to affiliate lounge locations with other travel documents to gain access for themselves and guests while traveling. The rules for credit card issuers differ slightly when it comes to which lounges can be accessed as well as how many guests can enter with the cardholder, so it is important to understand the particular rules of the membership.
Learn more about Priority Pass.