Air Taxi

This might be somewhere else but I can’t find it…what qualifies a flight as an Air Taxi on the Airport Information Section under Gateway Operations?

For example, KBOS has 2131 OPS/day, 671 commercial and 353 Air Taxi

What is the difference between Commercial and Air Taxi?

It depends on what part of the FAR (Federal Aviation Regulations) that the aircraft operate under. There’s Part 121 and Part 135.