Delta Air Lines and Virgin Atlantic Airways will expand their partnership between the U.S. and U.K. next year with the introduction of Delta’s daily nonstop service from Philadelphia to London.

The service begins April 7, 2015 and will bring Delta’s total number of daily flights between the U.S. and London Heathrow to 12. By next summer, the partnership will offer 39 daily flights between the U.S. and the U.K., including ten daily flights between New York and London.

“Delta remains committed to enhancing the customer experience as part of our joint venture with Virgin Atlantic,” said Jeff Lobl, Delta’s managing director – Network Planning and Alliances. “The addition of Philadelphia to London Heathrow service provides passengers with more choices and greater access to the U.K. from the U.S.”

Delta currently serves London Heathrow from seven cities in the U.S. – Atlanta, Boston, Detroit, Los Angeles, Minneapolis, New York and Seattle – and will add an eighth city when it begins operating a daily flight between Newark and Heathrow in March 2015. Philadelphia will be Delta’s ninth city with service to Heathrow.

Delta Air Lines, www.delta.com