Star Alliance Gold status is given to customers who have reached a higher level of a member airline's frequent-flyer program. Benefits are priority reservations waitlist, airport stand-by, check-in and baggage handling; an additional checked luggage allowance of 20 kg (or one extra piece, where the piece rule applies), and access to designated Star Alliance Gold lounges the day and place of departure with the presentation of a Star Alliance boarding pass. Some airlines also offer preferred seating (an exit seat or a special section of the plane); guaranteed seating on fully booked flights, subject to the booking class code and notice period, and free upgrades in the form of a voucher, certificate or automatic upgrade at check-in. United restricts US lounge access for their Gold Members to long-haul international passengers; Gold members from other carriers are welcome in US lounges run by United on all itineraries.