From what I have read, late war LW airfield flak was murderous, especially in Me 262 bases... IIRC one had up to 200 barrels of 2cm Flak defending it, so you had to stay well clear of the runways and near vicinity, and second strafing passes were a no-go. The first one, using the element of surprise and given the reaction time of the gun crews may have success, a second attemp was pretty much suicide.