arff in usa

ARFF Index - Number

Index A - 201

Index B - 176

Index C - 92

Index D - 22

Index E - 27

Total 518

per faa part 139 list - per
https://docs.google.com/spreadsheets/d/1TEAkpYi284dmHj4icK7_Y070qiF4daBp/edit?usp=sharing&ouid=110283765622667155852&rtpof=true&sd=true

Index A is 1 small arff vehicle

Index B is 1 large arff vehicle or 2 small - ish

Index C is 2 large arff vehicle

Index D and E is 3 large arff vehicle

it is much more complicated than that - but thats a general overview

this list probably does not include some military fd and some private
fd - like boeing in seattle area or cape cod naval air station and
maybe some uscg air stations