I wish I had a navigational record of how mealtime conversation got there, but there it was. Somehow it became sufficiently relevant to the conversation that a member of our party chose to mention, in all seriousness, that there is a law forbidding two devout Christians from flying together as as commander and first officer of an aircraft, in order to avoid having an aircraft be completely unmanned in the event of the Rapture.
Now, I consider myself to have a pretty thorough knowledge of Canadian Air Law. I hold an airline transport licence and have worked in Canadian aviation under part 702, 703 and 704. I have written the dispatch examinations twice and I hold the qualifications required to run a flying school, plus I have taught commercial air law courses. I get a lot of things wrong in my memory, and laws do change without a lot of fanfare, so I don't pretend to know everything. I have at some point read, if not memorized, almost all of the Canadian Air Regulations and something like that would have stood out in my memory more strongly than the Star Trek-ready requirement to obtain permission of the pilot in command before entering an aircraft in flight. There are some sections of the standards down in the 500s that I've never read, as I've never been a PRM, but anything on crew composition would be in part seven. And now I'm citing air law sections now just to avoid having to say what a bizarre law that would be.
I think I managed to remain neutral as I said, "I'm pretty sure that isn't in Canadian law. There is no dispatch requirement for tracking the religion or virtue of crewmembers." I'm pretty sure it isn't in US air law either, as I'm sure one or more of my irreverent American correspondents would have enjoyed watching my virtual eyes pop, right over the Internet after they sent me the link.
I cannot recall ever seeing a religion-related aviation regulation or company policy anywhere, but I'm sure a few exist. I'd be surprised if Air Canada doesn't have uniform policy exceptions for turbans, kippahs and headscarves. I think one British airline bans all religious symbols while in uniform: I remember a kerfuffle about a CSA who was forbidden to wear a small crucifix necklace to work. I would imagine something has been worked out so that when both members of a crew are Islamic they can take turns observing scheduled prayers. It shouldn't be too hard to punch in Mecca on the FMS to get a bearing. But those are practical day-to-day issues, not preparation for the end times.
"Perhaps," I suggested, "It's company policy somewhere."
It's contradictory, though. A company would not find a reason to concoct such a rule unless it was run by very devout Christians. But a company run by Christians who spent any amount of time worrying about unmanned post-Rapture vehicles would not want to--and in any case would not in Canada or the US be allowed to--discriminate against Christian prospective employees. Yet the only ways to implement such a policy would be either to track the Rapture-eligibility of all pilots and schedule promotions and vacations such that a sufficient pool of sinners was on hand at all times for both the left and right seat; or simply to restrict pilot hiring to sinners only.
And then you get to the issue of why would the company care? Any passengers or bystanders on the ground who were not also swept up in the Rapture would be damned to hell in any case, what difference would being killed in a plane crash make? My experience may be non-representative, but I lived and worked with some very kind, compassionate and intelligent Christians who in prayer affirming their allegiance to Jesus Christ finished with "and anyone who believes otherwise can go to hell," so I can't see them being sufficiently concerned with the manner of death of the non-chosen as to make regulations ensuring it wasn't airplane-related.
Somehow everyone avoided the obvious reason as to why such a law wasn't an issue, so I'll leave it as a straight line for you commenters.