There 2 other SP games available. These are WinMBT, and WinWW2. Both are free downloads from:
WinMBT covers the years 1949 thru 2020, and WinWW2 covers 1930 thru 1949.
Both games have airstrikes, spotting aircraft.
MBT, with the later technology has many other features - helicopters, SEAD, COIN, gunships, ATGM, laser range finders - these are only a few. The unit choices in both WW2 and MBT are much greater than in any SPWAW based game.
If you are looking for early ww2 battles, WinWW2 is a very good selection...
Welcome to the club!