Changed the controller

src/main/resources/flight_editor_form.fxml

@@ -9,7 +9,7 @@
 <?import javafx.scene.layout.RowConstraints?>
 <?import javafx.scene.text.Font?>
 
-<GridPane hgap="10.0" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="289.0" prefWidth="600.0" vgap="10.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="seng202.group9.GUI.RouteAddController">
+<GridPane hgap="10.0" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="289.0" prefWidth="600.0" vgap="10.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="seng202.group9.GUI.FlightEditorController">
   <columnConstraints>
     <ColumnConstraints hgrow="SOMETIMES" maxWidth="280.0" minWidth="10.0" prefWidth="168.0" />
     <ColumnConstraints hgrow="SOMETIMES" maxWidth="515.0" minWidth="10.0" prefWidth="402.0" />