Yes, you can absolutely use Priority Pass for domestic flights, provided there is a participating lounge or "lounge alternative" in the terminal you are using. Priority Pass is a global network and does not distinguish between domestic and international itineraries; as long as you have a valid boarding pass for same-day travel and your membership is active, you can enter. In the United States and other large domestic markets, many Priority Pass lounges are located in domestic terminals used by carriers like Alaska Airlines or JetBlue. However, it is important to check the Priority Pass app before your trip, as some lounges are located "landside" (before security) or in specific terminals that may not be connected airside to your gate. Furthermore, many U.S. domestic airports now feature "Lounge Alternatives," such as airport restaurants, gaming lounges, or spas, where members receive a credit (typically $28 per person) toward their bill. Be mindful that some memberships issued through American Express or Capital One may exclude these non-lounge restaurant credits.