A small example from last night:

Looking at the map I saw A107 had all it's hangars shut down, two(?) small moving dots indicated high buffs. At the same time suddenly a huge red darbar appeared in the sector. NOE! Apparently a clever double prong attack with a combination of very high and low elements.
I jumped into a262 and raced on the deck from A122 to A107, with the intention to hunt down the goons, all the while yelling ALERT on country channel
Now the closest rook base was A93, and all other rook bases had also been to the north and north east. The town was located to the west of the base, but very close to it. But the most important geographical feature: A big stretch of mountains, shielding base&town to the north.
So a goon would have a hard time to get to the town directly from N (would have to climb over the mountain), even more so from E (would have to cross the base), and from SE too (way too likely to run into enemy fighters coming from Knight bases 122 & 121).
So the most probable line of approach was the one I have marked in red - more or less. That was the area I started to patrol after reaching the town, and when I saw more support arriving near base/town, I quickly increased my search radius to cover some more "unlikely spots".
Such a huge, well planned mission has invariably more than one goon in it, and goons arriving early tend to sit somewhere on the ground - mostly near the shoreline, hilly terrain is avoided for obvious reasons.
End of the story: Four goons died to my guns in this sortie, all along the route I marked above.