Number Of Direct Flights Between Domestic Airports

Hello,

I’m looking for air traffic data for a personal project. I’d like to be able find the number of direct flights (ideally passengers too, but this is probably too granular) between two US airports. The way I’m envisioning it, the data for a given period of time would look something like the matrix below, where departure airports are column headers, destination airports are row headers, and the values are the number of flights (or passengers):

Airport ATL DFW DEN … ATL XXX 12 8 … DFW 11 XXX 10 … DEN 9 10 XXX … … … … … XXX

I know the data needed to create something like this must exist somewhere, but the closer to the end product displayed above the better. Thanks!