Southwest Airlines - Identification Requirements for a teenager?

It's not up to Southwest Airlines - the TSA requires identification to fly, not the airline. That said, an expired license is not acceptable. You CAN fly with other documentation, but it will be much more difficult.

The following is from the TSA's website: Q. If I lose my ID during travel, what secondary forms of ID will be accepted? A.

Passengers who do not have a valid photo ID, such as State-issued driver’s license, should bring any ID or documents they have available to assist in verification of identity. Passengers need at least two alternate forms of identification, such as a social security card, birth certificate, marriage license, or credit card. The documents must bear the name of the passenger.

Also, one of these documents must bear identification information containing one of the following: date of birth, gender, address, or photo. If TSA can confirm the passenger’s identity, they may enter the secured area, but they could be subject to additional screening (I know your husband didn't actually lose his license, but since it's expired, it's not technically valid). At any rate, it will be difficult at best to fly without a valid drivers license, so it's probably easier just to renew it.

Which he would have to do to drive anyway...

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