The term 'MAJOR LANDING SITE' can be solved by the crossword solution 'JETPORT', which is a seven-letter word. A jetport is an airport specifically designed for the landing and takeoff of jet aircraft. Jetports are typically larger than regular airports, as they are designed to accommodate the increased size and weight of jet aircraft. Jetports are also equipped with more advanced navigational aids and other features to ensure the safe operation of jet aircraft.