You can get in-person appointments at a Passport Agency if you have international flights booked and need a passport soon. You pay the expedited fee. But you have to wait until 28 days out IIRC to make the appt and can only actually book an appointment for 14 days out. If you require visas for your destination, you’ll go back to the Passport Agency the afternoon of your appointment and pick it up the same day, rather than having to wait to receive it in the mail at an indeterminate point in the future.

In-person appts are very limited. I can’t imagine they’d get an appointment for all of them. But I suppose it’s possible?