An ID is not required for any US domestic travel, never has been, never will be. Providing ID makes your travel through TSA check points go smoother, but it's absolutely, unquestionably not a requirement. I've traveled numerous times without ID and have never had any significant issues or delays and don't expect any in the future either. There are obviously those who insist it is a requirement or will soon be a requirement, but that's very silly. Imagine traveling from Oregon to Maine, loosing your wallet, having no ID and then being effectively stuck in Maine until you can prove to the local DMV you are who you say you are so they can issue you an ID. Absolutely ridiculous.<p>Yes, the TSA obviously wants everyone to think they need ID because having thousands more people going through checkpoints everyday without proper ID will tax the system. However, the Real ID legislation requires all agencies who require Real ID to have other mechanisms in place to deal with individuals who don't have identification, for obvious reasons.