Definition: Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.
Input: Steps: (1) An airline reservation is made (2) The passenger arrives early at the airport (3) The luggage is checked (4) The passenger waits in line (5) The passenger shows their identification and gets a boarding pass (6) The passenger goes to their gate (7) The passenger gets in line when it's time to board (8) The plane arrives at the destination (9) The passenger gets off the plane at their destination.  
Where does the following step fit into the given list of steps: The person boards the plane 
Output:
 After step 7. 