Because he was in a hurry.
The flight Dean took didn't belong to a major airline.
Otherwise, there wouldn't have been only one female flight attendant in first class.
This was a short-haul flight, a direct one lasting over six hours. Although it offered meals and drinks, there was nothing too high-end.
Fortunately, knives and forks were available.
They weren't very sharp, but deadly enough!
Under the nervous gaze of the gorgeous flight attendant, Dean cleared the area of these potentially lethal weapons. He then mixed some 'seasoning-grade lime powder.' Approaching the flight attendant, he held her in his arms and soothed her in a gentle voice, "Stay calm. Don't be afraid. Whatever happens on this plane, I will take action."
He wasn't flirting but rather ensuring he had a helper who could remain composed.
The situation was now very troublesome.
The air marshal hidden on the plane had lost contact.