to the entrance of all terminals. The new system consists of a mostly elevated structure, running the length of Hegenberger Road. In May 2015 Oakland International Airport's Moving Modern program construction commenced a $100 million renovation of the Terminal 1 complex. The project included seismic architectural retrofits in central buildings, replacement and upgrading of infrastructure and improvement of the passenger environment. The project was completed in Spring 2017. In 2016 Norwegian Air Shuttle announced nonstop flights connecting Oakland with London beginning the following spring. British Airways responded with their own service to London, with both airlines providing service to London's Gatwick Airport. American Airlines also returned and re-branded, following a merger with US Airways; the latter previously having a short-term presence at OAK, following a separate merger with America West Airlines during the previous decade. Southwest Airlines inaugurated nonstop flights from Oakland to Mexico for the airline's first international nonstop flights from OAK. The additional routes also gave the airline a combined total of 30 year-round and seasonal flights at the airport as of early 2017. In 2017 Norwegian Air Shuttle announced nonstop flights connecting Oakland with Copenhagen on a seasonal basis from March 28, and Oakland with Barcelona from June 7 to operate year-round. Level, a new carrier owned by IAG, responded with their own Barcelona service, started flights initially operated by IAG partner Iberia on June 2, with both airlines providing service to Barcelona El Prat Airport. In the months following, Norwegian announced in May the introduction of nonstop flights between Oakland and Rome Fiumicino started on February 6, 2018, and in July the introduction of nonstop flights between Oakland and Paris Charles de Gaulle began on April 10, 2018. Recent years Between mid-2018 through early 2020, OAK had both lost and was losing domestic and international nonstop routes; the indefinite grounding of the Boeing 737 MAX by both Southwest and American, the "restructuring" of schedules by airlines, and a lack of demand all contribute to this. British Airways ended service in October 2018. Level moved its operations to SFO, as did Norwegian Air Shuttle for its seven routes serving OAK. Southwest Airlines ended systemwide service with Newark Liberty International Airport in November 2019, followed by discontinuing three more routes with OAK effective January 2020. Three other routes are currently suspended by Southwest until further notice, while American did the same during summer 2019 for service with Dallas/Fort