I'll send this to SraJMcGin, our Spanish expert.
There is no reason to use a "personal a" in front of aeropuerto as that is an inanimate object = Antes de ver el aeropuerto...
I don't know the level of Spanish you are in, nor do I know the "directions" for writing the essay. I would have used the imperative = Pack, instead of the "historical present" "you pack/do pack/ are packing. However, I will only correct any errors I see here.
tus vacacion = incorect as the adjective is plural and the noun is singular. IF the noun were singular the "o" would have an accent mark. The word "vacation" is always plural in Spanish = tus vacaci ones.
With a verb of "motion" you arrive AT or TO the airport...Cuando llegas al aeropuerto
"y ver a seguridad" makes no sense (and to see at security?) and you go to security? = y vas a la seguridad.
Same error with tus (plural) + identifación (singular). An adjective must have the same number (singular/plural) and gender (masculine/feminine) as the noun(s) modified. That is the grammar rule. = either "tu identificación" or if you ave more than one ID = "tus identificacines"
same thing with "tu tarjeta (misspelled)de embarque & I have no idea what "a seguridad" is doing th ere.
Even though English doesn't use the definite article with Security, it's better in Spanish = pasas por la seguridad. esperar means to wait FOR so you do not need to add "para" = esperas el vuelo.
The itinerary teaches/shows? It is an inanimate object; YOU will need to show it. "Cuando el vuelo llega, enseñas el itinerario"
Please understand that without the English of what you are attempting to say, I may not adjust this to your liking.
you line up "in order to" board the flight = haces cola para abordar el vuelo.
Después is an adverb but Después de is a preposition = Después de la salida (exit?) o r "after the plane leaves..." = Después de despegar (take off)...llamas a "tu amigo" or "tus amigos" para no llamar a (personal "a"_ los pasajeros.
What I need to see when you ask for a "translation" is: 1. your level of Spanish, 2. the explicit "rules" for writing the essay and 3. the English of what you are attempting to say.
Your final must be over? I's February 4 and I never did get a response!