These kinds of 135 operators are all over the place. Usually a one crew per airframe outfit. In their world, you're in rest when you're not on duty. Same thing with the 13 scheduled days off per quarter. Go ahead and schedule the days, but they'll be moved whenever the airplane needs to fly. If the plane doesn't happen to fly on a scheduled day then great - there's one of your 13.

The FSDOs know all about it and look the other way. The companies get away with it because they're hiring lower time guys happy to be strapping into a jet for better than regional wages. No need to make waves - just hang out, get some turbine time, and wait for that dream 91 gig.

Sorry, rant over.