London Southend Airport (IATA airport code SEN) is a minor international airport situated on the outskirts of Southend-on-Sea in Essex, England, approximately 36 miles (58 km) from the centre of London. The airport straddles the boundaries between the city of Southend-on-Sea and the Rochford District. Southend was London's third-busiest airport from the 1960s until the end of the 1970s, when it was overtaken in passenger numbers by London Stansted Airport. Following its purchase by Stobart Group in 2008, a development programme provided a new terminal and control tower, extended the runway, and added a connection to central London via a regular rail service running between Liverpool Street Station and Southend Airport Station on the Shenfield–Southend line, continuing on to Southend Victoria.