Have your airfare is conditionsCompany. Do not change. So, if you want to move the file date of 08/17/13 is the day you'll need to remove this file before 16/08/13. You must be implemented as soon as possible.
Airfare is another condition is never changed, so if you want to move the files from the date 17/08/13 is the date 16/8/13, you will need to cancel this file before, you will need to complete as soon as possible.
Your ticket is a knot is a B do not change, so if you want to move files from the day 08/17/13 as the date 08/16/13 you will need to cancel this file before, you will need to do this as quickly as possible