First-class fliers have a code. It’s subtle and usually comes with a glass of champagne. If you want fit in before you fall flat in a sea of stares, learn the unspoken rules—lest you mistake the amuse ...

As business class products become ever more luxurious, is it still worth the upgrade to first class?

JetBlue, which currently offers its highest-end Mint service with lie-flat seats on select long-haul routes, plans to introduce a domestic first class–style product on aircraft that do not have Mint ...