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ok, so after reading all of that i can say from my experience that corsairs on all my veteran/ impossible ironman games (i never reloaded , exccept for bugs) was the OVERKILL. In all the mods i have played so far. In over 600 hours. Stuffing your base with corsairs counters ALL AIRCRAFT no matter the size and maneuverability, no matter the speed or turn rate. Its the jack of all trades and master of most.
The biggest selling point ? Its flexibility. No matter what situation you are in there is nothing that cant be dealt with more corsairs.
The money sink ? I beg your pardon but having an aircraft for all situations and quickly stop ANY alien events from happening gains you the most points, economically. You can even plan ahead how many corsairs you need on an average in advance. If you wanna keep it tight you can be short on aircrafts if the country takes a big wave, your decision if its worth it to keep you from building 2 more corsairs. I dont think so.
Furthermore that you shoot down EVERY UFO means you have all teh choices and airstrike money as well. In my book there is a plus after roughly 20 days for every aircraft exluding things i could sell from the crash sites.
Later on the corsairs becomes even better because other aircrafts are getting more expensive while the corsair still does the best job compared to what it costs. AND it still has teh best flexibility as a bonus while you have to think how to balance other aircrafts advanatges/disadvantages out.
Once you reach the powerhouse with the name corsair theres practically no excuse for not dominating the airspace all the way through end game.
Edit: I may be wrong on some points though :D, and now that i think about it my oppinion may be majorly influenced by X-Division 0.98 :/ and not everybody is playing the same mod :P. So take my apologisies, all in all i think the OP is right !