a less what-if and slightly more serious alternative:
War Thunder.
Developper has done some IL-2 work already, has no Tanks background and aims high, even though he fails quite regularly.
+A Visually good alternative to the various quick mission builders of CFS3 and IL-21946 (shadowing, reflections, scenery shadows...)
+FM feeling ... okay - sometimes a bit nasty imo (P-40/wildcat spin)
+good TiR, Mic, Squadron integration
+Complex engine management, mags, Supercharger steps, proppitch...
+simple control of all the gunners
+ once logged in,(online login) there are a number of offline campaigns and missions to be played, once unlocked.
+ Stickers and Logos
+ Free. Fun.
-no advanced stuff like folding wings, tailhook, airbrakes, parking brakes set, man. Bombbay, true norden bombsight. Not a simulator.
-Mixed quality Plane models - whilst the single engined exemplares are proper, the multi engine types suffer in detail and even shape.
-young clieneel. Be prepared to fight people that have no clue about airplanes whatsoever, and that fly with mouse and keyboard, egoshooter style. Be prepared to OWN their scrawny little @**es

-few paintschemes, no way to paint your own ride.
3 levels:
1)arcade with all the classic helpers you imagine, autoreloading Bombs, use of multiple planes, over maps that resemble Unreal tournament, red and blue side can have the planes they want
2) realistic: proper war map, 1 plane, outside views and icons. Bombs and fixes only on airfield, red and blue can still have a mix of axis and allied planes
3)simulator: only inside cockpit (multiengine have no cockpit, only HUD view

) no icons, and the previous pleasing Ride you got in your 109 is over. Now she bites you in the Ozz if you do not watch exactly what you do. real map, carrier/ground start, real factions. but you can still fly a Typhoon over Burma, if the battle plays there.
here an example of the E-1 Warhawk landed and refuelled on a Jap base that our shermans snatched off them.
scoop is too wide and the Panel Flat-ish, but the cockpit is very useable.

J-1 from the front on a Run on the same airfield/Flak Position.
simulator level battle, she feels like an underpowered Battleship
Like she is running on one engine at full pull and STILL overheating like sauna.
outside view constols the gunners. notice the yellow circle - use your mouse to aim that. kind of like the B-29 fire controller.