clipboard maps are your friend. We're not talking about the icons on the actual clipboard map either, we're talkin about the detailed pictures of the airfield layouts you can get => right click on the map and select 'clipboard maps' then pick either small, medium or large airfield, then you'll see what we mean.
How to tell if its small, med or large? Small airfields have an icon on the map which has a single runway, medium airfields have an icon which has two runways, large airfields have an icon which have three runways.
everything you need to plan bomb/jabo runs perfectly