Delta Air Lines is launching a non-stop daily service between Seattle and London Heathrow next March.
The route will be operated by a 210-seat Boeing 767-300ER aircraft featuring 35 full flat-bed seats in business, 32 seats in premium economy and 143 in economy.
Outgoing flight 37 departs Seattle-Tacoma International Airport at 1840 and arrives at LHR at 1205 the following day.
The return service, flight 36, leaves Heathrow at 1220 and arrives at Seattle at 1440 the same day.
Currently, only British Airways services the Seattle to London route with a daily flight codesharing with American Airlines and Iberia.
Earlier this month, Delta and Virgin Atlantic began a codeshare agreement across 108 routes in North America and the UK (see online news, June 24).
Glen Hauenstein, a Delta executive vice president, said: "Our international expansion in Seattle is possible because of our partnerships with Alaska Airlines, Virgin Atlantic Airways and Air France-KLM.
"Together the airlines can provide customers in the Pacific Northwest with an unmatched global network and an industry-leading customer experience on the ground and in the air."
Tickets for the route, which starts on March 29 (March 30 for the return service), will be available to purchase from July 27.