If you don’t have a credit card with lounge access, you may still be able to gain entry. Many airlines allow you to buy memberships or one-time passes for a fee. United Airlines, for example, sells one-time passes for its United Clubs for $59. American Airlines Admirals Club offers several annual membership options with fees of up to $1,250 for a household membership. Some lounge networks, like Centurion, do not sell lounge access passes or memberships.