Here is the second part of my summary. Can you please check if everything is OK now?
By the way, do you say "On which carriage or in which carriage is your seat?"
Which bus number goes to the city centre OR Which number bus goes ....?
1) Go into the departures lounge where you can buy things in the duty-free.
About half an hour before take-off go to your gate number and wait for your flight to be announced.
2) After you board the plane a steward, or stewardess will help you find your seat. If you have (any) hand luggage, put it in the overhead luggage locker.
3) Fasten your seat belt during take-off and landing. The stewards can offer you a snack during the flight.
4) When the plane lands, wait for it to stop. Disembark from the plane, go through the terminal building and collect your luggage from the baggage carousel.
5) Go through customs. If you have anything to declare, tell the customs officer. Exit the airport through the arrivals lounge.
1) Go into the departures lounge where you can buy things in the duty-free shop. About half an hour before take-off, go to your gate number and wait for your flight to be announced.
2) After you board the plane, a flight attendant will help you find your seat. If you have any hand luggage, put it in the overhead luggage locker.
3) Fasten your seat belt during take-off and landing. The flight attendants will offer you a snack during the flight.
4) When the plane lands, wait for it to stop. Disembark from the plane, go through the terminal building, and collect your luggage from the baggage carousel.
5) Go through customs. If you have anything to declare, tell the customs officer. Exit the airport through the arrivals lounge.
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By the way, do you say "On which carriage or in which carriage is your seat?" On what type of transportation would this be happening?
Which bus number goes to the city centre OR Which number bus goes ....?
I'd say this: Which bus goes...
Are you sitting IN the carriage or ON it? On it would imply sitting on the roof.
Is the subject the bus or the number?
1) Go into the departure lounge, where you can buy things in the duty-free shop.
About half an hour before take-off, go to your gate number and wait for your flight to be announced.
2) After you board the plane, a steward or stewardess will help you find your seat. If you have hand luggage, put it in the overhead luggage locker.
3) Fasten your seat belt during take-off and landing. The stewards will offer you a snack during the flight.
4) Right.
5) Go through customs. If you have anything to declare, tell the customs officer. Exit the airport through the arrivals lounge. (in my experience with flying, I am not aware of an arrivals lounge.)
Sure, let me check the second part of your summary:
1) Go into the departures lounge where you can buy things in the duty-free.
About half an hour before take-off, go to your gate number and wait for your flight to be announced.
2) After you board the plane, a steward or stewardess will help you find your seat. If you have any hand luggage, put it in the overhead luggage locker.
3) Fasten your seat belt during take-off and landing. The stewards can offer you a snack during the flight.
4) When the plane lands, wait for it to stop. Disembark from the plane, go through the terminal building, and collect your luggage from the baggage carousel.
5) Go through customs. If you have anything to declare, tell the customs officer. Exit the airport through the arrivals lounge.
Everything looks good now, well done!
Regarding your additional questions:
For the first question, the correct phrase would be "In which carriage is your seat?", as you are asking for the specific location of the seat within the carriage.
For the second question, both variations are correct. You can say "Which bus number goes to the city center?" or "Which number bus goes to the city center?". Both convey the same meaning and are commonly used.
If you have any more questions or need further assistance, feel free to ask!