Upvote:12
TSA will not allow you to pass through security to the airport's departure gates unless you hold (either printed or on your phone) a valid boarding pass and a valid form of identification. ID here is usually a passport.
Because you do not have a passport or other travel document, the airline will not issue you a boarding pass. Even if you have a ticket on the flight and a copy of your passport, the airline will not issue a boarding pass.
Without a boarding pass, you will be stuck landside at the departure airport, unable to access the departure gate.
(It's possible you'd be able to pass TSA Security with an electronic boarding pass (sent to you by email or the airline's app) without a passport, but if so you'd then be stopped by the airline at the departure gate and required to display your passport. Without a passport suitable for the flight, you will be denied boarding.)