As much as I like to be organised on arrival, this turns out to be a multiplayer game, and I often find that I need to change my plans based on events that occured after my takeoff, such as other pilots arriving at the field ahead of me and dropping on my planned targets, the field I was *intending* to attack being taken, or my having lost an engine during fire just prior to the bomb run.
Nett result is that, while I like to have a plan, much of the time I arrive at the target and need to improvise. It's a PITA having a run wasted because in order to be bombadier you have to keep hopping up to the pilots seat =)
K