The only modern airline I have heard of doing a 'double bed' is Virgin Atlantic, on their 747's
See this link;
http://www.virgin-atlantic.com/en/gb...provements.jsp
Two upper class suite beds together,with the partitions removed. 56cm each, making 112 cm wide double bed over 208cm in length. Never tried it, don't know anyone who has. Think it was on a trial basis, so not sure if it is still available.