Source: Elines
Flight Attendants who are working crew members will have the opportunity to travel with up to two buddy pass riders who will travel at the Flight Attendant’s personal pass classification. This applies to both the domestic and international travel and is available over two periods.
When creating your pass travel listing through United's employeeRes, remember to check the "traveling with working crew member" box to ensure sure your "buddies" are listed at the correct pass classification. You are required to notify the gate agent, in person, when your buddy/buddies accompany you at each city where they are boarded, as well as, at any connecting city with an aircraft change. If seats are not available, the buddy/buddies will travel at the unaccompanied classification on the next available flight on which they can be boarded.