Preventing a table iteration from reading a function value?

Hello,

I'm trying to include methods with the following tables, the data won't change ingame so I don't need to use classes. I have included the following data structure as an example.

When I try and attach a method to a table within "airport.airlines.Airline", such as :GetDestinations() I get an error "attempt to index local 'v' (a function value)".

My guess is that because I'm attaching a seperate method to airport.airlines, when my script iterates over the table it reads the method also, causing the error.

What can I do to prevent this? I know swapping the two around would work but that's not a clean solution.

Thanks for your time.

airport.airlines = {
	Airline = {
		Destinations = {
			airport.destinations.Zakynthos;
		}
	}
}

function airport.airlines:GetAirlines()
	-blah
end

for i, v in pairs(airport.airlines) do
	
	function v:GetDestinations()
		--blah
	end
	
end