 Most Amtrak rail stations in downtown areas have connections to local public transport.Amtrak also code shares with United Airlines, providing service between Newark Liberty International Airport (via its Amtrak station and AirTrain Newark) and Philadelphia 30th St, Wilmington, Stamford, and New Haven.Special codes are used to designate these intermodal routes, such as "ZVE" to designate the combination of New Haven's Union Station and Newark International Airport and the Amtrak connection between them.