There are quite a number of airbases in the sim - the complete list is below.
A usefull map of the theatre can be downloaded from
Most of the airfields use the same scenery objects as seen at Berne and Calais.
Berne - This is representative of most airbases in the sim.
Calais - This is representative of most airbases in the sim.
Central Berlin - no airbases but much more detail here as you would expect.
Central London gets the Royal treatment !
There is no actual airbase but London gets the most detailed treatment in Microsoft Combat Flight Simulator (1998), with numerous landmarks dotting the Thames River.
Central Paris - gets a detailed treatment.
Interlaken in Switzerland - Spectacular mountainous scenery. This was quite jaw-dropping in 1998.
Leipheim - 2 runways
Lucerne - Switzerland - Mountainous terrain
Manston - IK - some rolling hills
Southhampton - No airbase, but what were in 1998, quite exciting and convincing 2-D bitmaps of the docks.
Saint-Malo - At this altitude the urban detail looks quite uncanny. Dogfighting over this made my stomach leap in protest, providing excellent immersion.
Saint-Omer - a few buildings near the strip
Schongau - mountainous terrain nearby
Thalheim - 2 runways, rolling hills nearby
Thames Estuary - no strip
Etaples - listed last in the sim's location menu becasue of the accent mark over the "E" in the French language.