Flight inventory

Create flight stock in flight inventory.
Stock is stored on a flight basis within sector.
  1. Each route can have multiple aeroplanes flying that route
  2. Each entry is a flight on a given day, either outbound or return
  3. Each flight has a stock id and a flight number
  4. Each flight can be given a different description
  5. Example [Outward]:-
  6. Enter Route type, direction, check in time and terminal