Delta Air Lines has introduced pyjamas for business class passengers on its Los Angeles services to Sydney and Shanghai.
The Skyteam members added the "sleep and lounge suits" to the Delta One cabins today.
Delta One also offers flat-bed seats with direct aisle access, Westin Heavenly bedding, noise-reducing headsets and Tumi amenity kits (see news, July 3).
Delta intends to extend its pyjamas offering on other long-haul routes. With effect from March, the airline will roll-out the light grey cotton loungewear on all of its flights between the US and China (Beijing, Hong Kong and Shanghai).
In a statement, Delta said passengers will be "encouraged to take the outfits with them and use them in their home, at the hotel or on future Delta flights".
Allison Ausband, Delta senior vice president – inflight service, added: "We know how important sleep is to our customers, especially on ultra long-haul flights where they're traveling thousands of miles halfway around the globe.
"With a full flat-bed seat, a Westin Heavenly duvet and now new Delta One loungewear, settling in on a long flight has never felt more like home."
American Airlines used to be the sole "big three" US carrier to offer pyjamas in business class.
Delta's joint-venture partner Virgin Australia also offers complimentary sleepwear in business class on long-haul flights.
Between the two carriers, passengers have access to three daily flights to Sydney and Brisbane with connection opportunities to 40 destinations in Australia and New Zealand. Through Delta's hub in Los Angeles, customers arriving on the joint venture's South Pacific flights can connect to 53 North America destinations.