I think DL's BizE only offers the Neuhauss on certain routes. I've gotten it to AMS, but think I've gotten Godiva more often.

My vote goes to Finnair. Last year in J I got a pair of truffles on a JFK->HEL flight that were beyond superb. They were as good as Teuscher's. According to the purser they're from a mom & pop shop in Helsinki. I wish I could remember the name...