There is not only the possibility that the Captain and First Officer were conspiring to delay the flight as part of a labor action, but it is also possible that alien beings took over their minds as part of a vast plot to eradicate life on Earth as we know it.
Occam's Razor suggests that there is a more likely explanation as set forth by
H.I.McDonough in
#2 .
I vote with Mr. Occam on this one.