Correct me if I'm wrong, but you did not specify the logic to fill the entity Flight data. The association is not necessary for the use-case as you described above. You might want to check out this learning path I will link below. It goes in depth how you can import and export data with Excel using marketplace modules.
Learning Path: https://academy.mendix.com/link/paths/44/Importing-and-Exporting-Your-Data
Import part: https://academy.mendix.com/link/modules/142/lectures/1224/4.1.2-Import-Stores-and-Countries
Also you do not need a microflow to show a descending sort order. Below some screenshots how you could show this in a page. I used the data grid widget and set the Sort order to the date attribute with "Descending"