You can use the flight fields for this. I just added a function to the flight to make it easier to display in a template.
In the admin, go to the flight, under Custom Fields, you can add "Departure Flight", and a value.
Then in the template, you can put:
{{ $flight->field('Departure Gate') }}
It's kind of a pain with a lot of flights, but the importer will have a way to be able to add the fields and values right in the CSV (https://github.com/nabeelio/phpvms/issues/194)
I might add another table, like with PIREPs, that holds a "master" list of the flight fields and then it'll show them on the create/edit page as a main list, so you don't have to type "Departure Gate" over and over.