Bookmarked this topic to reply to it later, but there is really a simple way to do this using FlightRadar24, all the other methods are somewhat tedious and may not show the aircraft on that route.
Type in the name of your airline and click the search suggestion for your respective carrier. Then go to the “Routes” page. I have used Air Mauritius as an example. You will see a map of the routes of the airline that are going to operate in the next 7 days, click on the airport then boom. You get the destination, aircraft, flight number, etc.
You can also click the flight# of your route for additional information + a replay for the previous flight, or the tracking of the current live flight if it is currently flying
Easy, see! You can also do the same for all routes from an airport in the next 7 days.
Type in the airport name or ICAO or IATA or city, go to the routes page again. Select a destination on the map, then boom! You get the same attributes as above. Easy! You can also select arriving/departing flights on both airport and airline routes. No need to search google for the flight number/aircraft/etc. Everyone who does that is making it harder on themselves than it really is.