I think that Co-Pilot is a better example.
Except remember, the co-pilot can relieve the captain and take over the controls if he believes the captain has become incapacitated, or prevent the flight from taking off if he believes the captain or aircraft is unsafe to fly, under the principles of crew resource management.
It’s no longer like Robert Stack in The High and the Mighty; indeed I have an amusing memo to co-pilots at American Airlines from the 1940s which completely clashes with the roles and responsibilities they now enjoy at present.
Thus on the basis of CRM, co-pilot is no longer a good analogy. The seniormost flight attendant, sometimes called the Purser, or Cabin Services Director on British Airways back in the day, might be a better analogy, in that the Blessed Virgin Mary makes sure everyone, including the angels and other saints (who I suppose under this analogy we could liken to cabin crew), pay attention when her Son is speaking.
Since with CRM, the Holy Trinity really becomes more like the Captain, First Officer and Second Officer, except the Second Officer or Flight Engineer is now an extremely rare position with the retirement of most older 747s, DC-10s, and the last of the 727 and DC-8 freighters.
That said, to be clear, in engaging with the airliner crew metaphor at all I am making a huge leap and all of these metaphors fall short of the precise technical language used to describe the Holy Trinity and the relationship of Christ our Lord, God and Savior, the Incarnate Logos, to His Father and to us, and the role and purpose of our most blessed and glorious lady Theotokos and ever Virgin Mary.