Hypothetical Time Travel Question

i think you may be grasping what i am trying to say. say time travel is created at time ( X ). It would make sense that we would not be able to travel to anytime prior to ( X ), but would be able to travel freely anytime after ( X ). Although the airport analogy may not be the best to use in this situation, i think it gets the general idea across. how about, you cant listen to a cd without a cd player.