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As you know, I used to determine plane 'usage' by simply adding kills and deaths to get a ballpark estimate, as sortie numbers aren't published. (Actually, total sortie time would often be even more meaningful)
With the sortie percentages of tour 210 being posted today, I could check how my method holds up. Here the top 20 fighters by both methods:
Generally, bomb trucks score a bit higher when ranked by sorties instead of (K+D), but the results are (in my opinion) still reasonably close.