In the Activity Filters section of the Shipment Filters panel, click Add Milestone.

For the Event select Flight Booked. 

For the Type select Actual Time. 

For the Logic select is between. 

For the Date select Last Month.  

In the Attribute Filters section click Add Stop.

For the Location select Any Stop. 

For the Type select Airport Code. 

For the Logic select is. 

For the Name select the airport code. This field is searchable. 

Click Apply Filters.