Christ post the reg instead of getting snippy.

§ 135.243 Pilot in command qualifications.
(a) No certificate holder may use a person, nor may any person serve, as pilot in command in passenger-carrying operations -

(1) Of a turbojet airplane, of an airplane having a passenger-seat configuration, excluding each crewmember seat, of 10 seats or more, or of a multiengine airplane in a commuter operation as defined in part 119 of this chapter, unless that person holds an airline transport pilot certificate with appropriate category and class ratings and, if required, an appropriate type rating for that airplane.

So in summary, it's gotta be:

PIC, and in pax ops, and:

Jet, or
10 or more pax seats, or
Multi engine commuter

Also there's some old info still making its rounds that one of the "ors" is an "and," but that's based on an erroneous FAA official interpretation that's been officially corrected.