[Nocturnum]

Try these.
1. Luftwaffe Pilot in BOB. Warning - this is a fun one I think but the flights to and from target are about 10 minutes. Not to everyone's liking but unavoidable for the subject matter. And there's always timeskip.
http://mission4today.com/index.php?name ... ls&id=1847

2. RAF Pilot France. It starts slowly as it follows the French campaign in 1939/40 but after about 10 missions you get some big German formations to attack. The earlier missions are good training for flying the Hurri MkI. They all have combat but the early ones just have a few bombers or fighters to take on.
http://mission4today.com/index.php?name ... ls&id=3288

3. Not a campaign, just a single mission in different weather conditions.
BF109s vs about 60 B-17s.
http://mission4today.com/index.php?name ... ails&id=99

Of course, if you enjoyed Spit n fire you should also like the precursor Hurricane Season. It's harder due to the plane but that's how it was for those guys.

4. Hurricane Season
http://mission4today.com/index.php?name ... tails&id=4