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The passport is to prove US citizenship. Otherwise you cannot reasonably distinguish between permanent residents and citizens. Both can have a driver's license. Visa holders can have a driver's license too but it mentions the expiration date of your visa.

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This is not true. There’s no need to distinguish permanent residents from citizens because both have the exact same rights concerning domestic flights.

> The passport is to prove US citizenship.

That's an incredibly flawed thing to ask for with domestic flights, though. Most US citizens don't have a passport at all.

A birth certificate or social security card would probably suffice, too.

Not a social security card, as it is explicitly not a valid ID. It even says so on the card.

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