Generally, no, a standard United domestic First Class ticket does not include lounge access in 2026. Unlike international Business Class (United Polaris), a "United First" ticket for a short-haul flight between cities like Houston and Denver does not grant you entry into the United Club. The only major exceptions are for specific "Premium Transcontinental" routes, such as non-stop flights between New York-Newark (EWR) and Los Angeles (LAX) or San Francisco (SFO). On these designated routes, United Business passengers do get United Club access. For all other domestic first-class travelers, you must have an annual United Club membership, hold "Star Alliance Gold" status with a non-US airline (like Air Canada or Lufthansa), or use a "one-time pass" from a United credit card (like the United Explorer Card) to gain entry. While you get "Premier Access" for security and boarding, the actual "lounge luxury" is reserved for international flyers or those who pay for membership, making United's policy consistent with other major U.S. carriers like Delta and American.