"Yeah, cause FBO's don't have procedures or anything like that, right? "Standard Procedures" is a subjective term. Many places have their own standard procedures, including plenty of FBO's and Part 61 flight schools- despite what you may think. Just because they might be different than the holy Comair's procedures, does not mean that they are "non-standard."
In the 4 FBO's, and 3 military aero clubs that I have flown with, there was no such thing as flows or standard call-outs. There were at Comair, and in the 727 training using Boeing's procedures while I was getting my F.E. ticket, and at all of the 121 operations that I have worked for, been contracted to, or jumpseated with.
"how do procedures for flying left seat in a Seminole have anything to do with sitting sideways in a 727, other than maybe using CRM or monitoring engine instruments?"
The F.E. is the first one to look at the flight plan, and the A/C log book. At Comair, we got the "can" from dispatch, and had to do exactly what I do now.......look for open write-up's.....all inspections up to date.....finally you do the take-off performance......do you have a backseater on this flight?.....how much weight's back there?.......you get the idea.
Then we did the preflight. Out of all of the General Aviation places I've ever flown at, only Comair expected it's pilots to know what kind of hydraulic fluid was in the nose strut.....what an impulse coupling is. I was impressed, and I already knew all of that from A&P school. They expected the pilots to really "know" the plane, to be able to draw the systems, and have all of the operational regs down cold.
BUT MOST IMPORTANTLY
Everything was/is standardized. There is none of this, "My instructor likes me to do it this way" It's just like 121 airlines, and unlike any FBO I've ever flown with.