When you have a placement that is flighted you may need to delete a specific flight and not have dates of the remaining flights recalculate. For example, you have a placement running July-October, flighted by calendar month, and you need to delete just the August flight -and do not want the September and October flights to recalculate to August and September.
The first thing to do is on the September flight click on the chain icon in the Start Date field. This will bring up the dialog that allows you to set the rule for how Specific Date.
The Start Date is set, by default, to start right after the previous flight. Change this to use the Specific Date option.
This will allow you to delete the August flight without September automatically reset it’s start date.