business class etiquette

Cabin pressure and bone dry air genuinely dull sweetness and smell, and airlines' top sommeliers build entire wine programs around fighting that effect.

Nobody explains business class etiquette in the safety briefing, but the cabin runs on it anyway. Keep the tray, skip the bread basket, and ask for the mattress pad before it's too late. Most regulars didn't learn this from a guide they learned it by almost getting it wrong.