The first thing is that I'm not necessarily privy to the conversation that there was between those pilots. I'm certainly not in a position to comment on what the pilots were thinking at the time and the reasons they did certain things.
What I can share with you is that we did exactly the same thing from a Nav Canada perspective with the two following flights that we did for the initial flight, which was to advise or request the FAA to reroute the flights around our airspace. The first pilot elected to go through, and the two other pilots elected to comply with the NOTAM and go around the airspace.