why might a drivers license # be required for a plane trip?

My manager is booking plane tickets for an upcoming conference in another state and he asked me for the following three things:
- my full name as it appears on my drivers license
- my DOB
- my drivers license #
The first two seem reasonable enough but the last item seems... fishy. I don't think I've ever been asked for a drivers license # when flying. I've been asked for a passport # when traveling internationally but not a drivers license #.
I mean, it seems to me that a drivers license shouldn't even be required for flying. You could be 40yo and not have a drivers license and you could get around exclusively using taxi's, uber's and public transit.
I realize a drivers license can be used to verify your identity to TSA but the documents you're providing to TSA don't need to be pre-registered or anything...
Best Answer
It would not be required for a plane trip. If that would be the case then many people wouldn't be able to fly...
Since this is a company trip then maybe the standard paperwork for trips asks for your drivers license number in the case you need a company/rental car one day.
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Why do you need an ID to get on a plane?
Passengers who do not or cannot present an acceptable ID will have to provide information to the Transportation Security Officer performing Travel Document Checking duties in order to verify their identity. Passengers who are cleared through this process may be subject to additional screening.What is required to fly on an airplane?
You must present an acceptable ID, such as a valid passport, state-issued enhanced driver's license or U.S. military ID, to fly within the U.S. You will not be allowed to fly if your identity cannot be verified.Do you need a Real ID to fly in the US in 2022?
\u2013 What do you need to fly in 2022? Beginning May 3, 2023, every air traveler 18 years of age and older will need a REAL ID-compliant driver's license or identification card, state-issued enhanced driver's license, or another TSA-acceptable form of identification at airport security checkpoints for domestic air travel.Getting My Driver's License
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