So a hypothetical scenario popped into my head, and after going through the Part 107 AC, the part 107 rules themselves, and even the entire Federal Register discussion with respondent notes, I am still terribly vexed on this one. Let's say I'm an owner/operator (in the aircraft sense), with a fleet of various drones, but for this scenario let's just assume I have 2 Inspire 1 RAW, and that as owner/operator, I am also a certificate 107 remote pilot. I've been asked to do aerial promotional cinematography at a State Park, and I have the authorization of the State DEP, Parks, etc. However, I only have 3 hours to conduct whatever authorized flights I can as the Park Rangers have to cordon off the flight line areas to ensure no pedestrian and hiker overflight. Let's further say that in order to do this, I decide to use TWO Inspires, and hire a SECOND Part 107 certified remote pilot. My flight line we'll call Unit A, and I would be responsible for all safety of the flight line for Unit A. The 2nd remote pilot, his/her operations we'll call Unit B -- they would be responsible for all safety for Unit B,and the decision whether to use one or more VO's would be theirs, of course. The situation might come to pass that we're both flying contemporaneously. Is there a minimum stand-off distance (and altitude, let's say this is in rugged terrain) between flight line Unit A and Unit B? Is it enough that the two remote PICs have an agreed upon mutual flight plan and are in two way radio comms? I really can't get any direct answers from the regs here, but my reading is that both PIC's are responsible for the safety of their own flight line and if both collectively judge that the flight plan can be conducted safely, and within VLOS and with proper see-and-avoid procedures, this could be conducted without a waiver. I'm curious what the other folks on here think.