All U.S. citizens need U.S. passport books if re-entering by air. Land and sea border crossings accept additional travel documents, such as U.S. Passport cards and Trusted Traveler cards.
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If you are in the U.S. and you are flying domestically, the good news is that you do not need your passport. You can fly by showing any photo ID issued by the government. It can be done in all 50 U.S. states. Not only that, but the U.S. overseas territories also allow this.
You'll need your passport to clear airport security and immigration, sure. But in instances internationally where you're asked to present identification, specifically note whether or not the actual passport is required—in most cases, an international driver's license or copy of your passport will suffice.
The American Citizen Services Section wants to remind all U.S. citizens not to travel outside the United States without a valid U.S. passport. While dual citizens may be able to travel abroad with alternative documentation, all U.S. citizens are required to present a U.S. passport to re-enter the United States.
If you are traveling when you run out of passport pages, you will still likely be able to return to the U.S., but you won't be able to continue on to other countries. If you need to travel on to other countries and are running out of pages while abroad, you should visit the local U.S. embassy or consulate.