When to recline? How to board? What to wear? Flight attendants and frequent fliers spell out the rules of the skies once and for all.

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It is my firm belief that everyone—no matter their age, gender, race, or Delta SkyMiles Medallion Status—needs to learn proper airplane etiquette, and the earlier the better. As a freelance travel writer, I get on lots of flights to and from different parts of the world, and I’ve seen the same silly mistakes, rude behavior, and even downright harmful stunts enacted by all types of travelers. But by that same token, I’ve also witnessed acts of generosity and helpfulness that all people universally appreciate.

So what, exactly, are the rules at 35,000 feet?…