They used to do this in the S3 in warbirds. It's a decent plan enough. But instead of a number of planes, I'd take that number, and assign certain squads to reach that number, within a minor fluctuation to accomodate the +2 rule for squad size. It worked out just fine in the S3, and seems it'd be easier to just check which squads launched from which base, rather than spend time counting planes.