the journey you take to get to the destination
route
a network to get somewhere
connection
when the plane is late
delay
when the plane comes to the airport
arrival
where you sit
seat
a person who is traveling on a means of transport
passenger
where your passport/visa is checked in a new country
customs
to save a place somewhere, usually in a hotel or means of transport
reservation
when you notify the airport staff that you are ready for your flight
check-in
a price you pay, usually for a ticket
fare
when the plane leaves the airport
departure
a doorway, exit, or entrance
gate
the point you are going to
destination