Okay, this is something I was never 100% sure of. And since I am trying to get into the writing scene I like to be as accurate as possible.
Is Travis a member of the senior staff? He is only an ensign, and he is only a helmsman. While Hoshi is also an ensign her position gives her a place of seniority because it's so vital to first contact missions. While flying the ship (shuttle, ect) is important, it is not vital to first contact missions.
I know in the episode 'The Expanse' he is brought into the briefing room along with everyone else who are seen as senior staff, but I am still unsure. It could very well be simply because he was main character and the writers did not want to leave him out.
I also noticed he has engineering skills, or at least it is implied that he does. In 'Dead stop', Trip mentions that Travis would consult him before making repairs which assumes he DOES in fact make repairs. And in Terra Prime he seems to know his way around repairing shuttles. Several other episodes make note of his technical skill.
So....talk to me about Travis.