Is there simpler way than scraping flightradar to determine Number of Flights between Two Countries?
ADS-B Exchange could be an alternative to FlightRadar24. They have (free if you host a feeder station) APIs so you wouldn't need to go through the headache of scraping. The data should be comparable and with ADS-B becoming mandatory in more and more regions (US since the beginning of the year and an EU mandate covering pretty much all business flights coming in June) you should be able to track anything but small VFR only aircraft.