society > armed hostility > hostilities in the air > [noun] > air operation > type of (4)
R.A.F. In war-time: a flight during which one does not expect to encounter the enemy. Also attributive and in stooge-around.
Military slang. A low-level flight for opportunistic strafing. Now historical.
Air Force. The action of participating in an opportunistic strafing mission. Cf. rhubarb, n. 6. rare.