Hypothetical Time Travel Question

Keep in mind that this is all very hypothetical, given that man traveling through time is only (as of now) an idea of science fiction.

But my question is. If someday we are able to send a man back in time, would it be correct to believe that we could only send him as far back as when we were first able to time travel?I mean, you cant land a plane without an airport, and i have a hard time believing that people just appear out of nowhere like in the movies. Thoughts?