Example of a 'bad' mission:
Attacking a field where dar bar is HEAVY red, with Jabo aircraft, from an adjoining field 25 miles away (Think about it, there are probably enemy A/C loitering at 25k above that field)
Alternative: Start Bombers from 50-75 miles away, allow them to get alt, start fighters from closer field, join up with Buffs when they arrive over escort field (delay escort mission start time by 7 min) and then proceed to enemy field.