embarkation
US /ˌem.bɑːrˈkeɪ.ʃən/
UK /ˌem.bɑːrˈkeɪ.ʃən/

1.
the act of boarding a ship, aircraft, or other vehicle for a journey
:
•
Passengers should proceed to the embarkation gate.
•
The embarkation process was smooth and efficient.
the act of boarding a ship, aircraft, or other vehicle for a journey