Generally, Premium Select passengers are expected to use the bathrooms located in the Main Cabin or the dedicated Premium Select section, rather than the Delta One (First/Business Class) bathrooms. On most long-haul flights in 2026, flight attendants maintain the "curtain" barrier to ensure that premium cabin facilities remain exclusive to the passengers who paid for that specific class of service. This policy is primarily in place to prevent long queues in the most expensive cabin and to maintain the "quiet" atmosphere for Delta One guests. However, there are rare exceptions depending on the aircraft layout and the discretion of the crew—for example, if a medical emergency or a broken lavatory occurs in the back. For 2026 travelers, the "pro-tip" is to assume that your ticket grants you access to the amenities and facilities of your specific cabin; while Premium Select offers better seats and food, it does not typically grant "lavatory reciprocity" with the lie-flat Delta One suites.