In earlier posts, I've mentioned that I don't like airplane food. When I fly I either fast or pack along macadamia nuts, applewood smoked bacon jerky, and dark chocolate. My favorite chocolate is Lindt's Excellence Supreme Dark Chocolate 90% Cocoa ($(removed) for ten 3.5-ounce bars on Amazon).
It's surprisingly smooth for a high-cocoa chocolate, and a 40g serving has just 3g of sugar (by comparison, a 40g serving of a Special Dark Hershey bar has 20g of sugar).
My wife and kids prefer Lindt's 70% cocoa bar, and I'm glad because that means they don't nibble on my stash of 90s unless they are desperate for chocolate.
I've yet to try Lindt's 99% Cocoa Excellence Bar (1g of sugar per 40g serving!), mainly because gram-for-gram, it costs four times as much as the 90% bars.