When you click on the Order dropdown list, all available sorting filters are shown. Click one of them to sort the aircraft display in the Gantt.
Using Sort Number
In addition to the standard sorting options, you can also decide the specific order that the aircraft are displayed in, by assigning a 'Sort Number'. The sort order is added in the 'Aircraft' window.
Note: This sorting order is global for all users. you can set up vehicle sorting for their own user credentials - see Vehicle Sorting below.
Vehicle Sorting by User Preferences
You can also create and store (global) specific aircraft sorting as shown here.
These are then available under the dropdown list 'Order'.
You can set a user specific default sorting view under User Preferences > "DefaultVehicleSorting":
