Kiddies DO NOT try this at home.

It is possible to see exact availability numbers in a CRS by selling 9, re-displaying, selling the next 9, re-displaying, selling the next 9, etc until a number less than 9 shows, add up sold + number remaining gives total unsold. ALWAYS remember to IGNORE so the seats return to inventory.

This practise is frowned upon by airlines as it reduces seat inventory while you are holding, seats which may be being sought through another terminal.