One strike from the air should be considered one airstrike yet here in America we conflate air raids with airstrikes.
We say one plane dropping one bomb is an airstrike but five planes dropping twenty bombs is also an airstrike obfuscating the definition of the term to lessen its rhetorical effect and the statistics of our shady war efforts.
In terms of airstrikes we should count every explosive munition because on the ground people are dealing with individual impacts but our imperial aerial view makes it look like just one big explosion.