DL is only worth the ride if there is a decent price advantage. the Airbus 330s not only have not been fitted with fully lie-flat seats like their 777s and 767-400s, the A330s are all “aging”. i’d flown on them 3 times on International BizElite recently and found them all with some nagging functional faults which they probably are not fixing since they are all in queue to be refurbished in due course. DL fully lie-flat seats are now only available on all 777s, 747s and only the 767-400s. i guess they must now be working on refurbishing the A330s and 767-300s but should be some time before they are all done. the existing “slanting” flat seats on the 330s are among the worst in the industry’s Biz-class product. AA’s newest Biz beds are definitely a far superior product since it’s one of the newest kid on the block and also with BA in Oneworld.