WWI: Rise of Flight
WWII: IL-2 Sturmovik: 1946 (which, with UP3, starts getting into Korean War-era jets)
Present day: Falcon 4.0 BMS
Note that these skew very, very much toward the "realistic" end of things by default, so you're not only expected to have a precise joystick (and, ideally, TrackIR or other means of head-tracking), but spend some time learning the handling characteristics, and in newer aircraft, the sophisticated subsystems. Crimson Skies or Ace Combat, these are NOT.
RoF and IL-2 let you ease off on the more realistic aspects if you want, though.