We had to get tot Sydney airport around 5 ：:00pm.

Because our departure time ｗwas 10：:00pm.

I said "Ssee you next time" to them.

We enjoyed the Australian lifestyle.

I appreciated their hospitality.

I would love if they (Mmy Australian friend and his wife)coame to Japan next time.

When athe airplane took off, I could see athe night view from amy window which was so beautiful.

Thank you all.!

We had to got to the Sydney airport around 5 ：00pm.

I would love if they (My Australian friend and his wife)coame to Japan next time.

When athe airplane took off, I could see athe night view from athe window which was so beautiful.

"a" refers to "any" object such as another airplane, "the" refers to a direct object like the airplane you were on!

We had to gotet to the Sydney airport around 5 ：:00pm.

Use “get” instead of got. Since you are specifying the Sydney airport, use the definitive article “the” in front.

I would love for theym (My Australian friend and his wife) to come to Japan next time.

Use “them” since your friend and his wife are the object of your statement. Add “to” before “come” since you want for them to do something

When athe airplane took off, I could see a night view from a window which was so beautiful.

Use “the” since you are describing a specific airplane

Because our departure time ｗas 10：00pm.

Usually when a sentence begins with a conjunction like "because," it's better to merge it with the previous sentence.

I appreciated their hospitality.

Same as "enjoyed" in the previous sentence, "appreciated" should be in past-tense since you're leaving and won't be receiving their hospitality for a while.

I would love for theym (Mmy Australian friend and his wife) to come to Japan next time.

When a airthe plane took off, I could see a night view from athe window which. It was so beautiful.

"the" are used here because we already know you're on a plane and the plane has windows. Thus, *the* plane you're on, and *the* window you're sitting next to.

We had to get tot Sydney airport around 5 ：:00pm.

Because our departure time ｗas 10：:00pm.

5 hours early?!

I said "Ssee you next time" to them.

We enjoyed the Australian lifestyle.

I appreciated their hospitality.

To match the tense of the previous sentence

I would love if they (Mmy Australian friend and his wife)co came to Japan next time.

When athe airplane took off, I could see a night view from a window which was so beautiful.

It should be an instead of a because airplane starts with a vowel.
However, in this case, it is the airplane because it is the particular plane that you are on.

We had to goet Sydney airport around 5 ：00pm.

I see why you would have put “got”, but the correct usage for this particular phrase in this context, “we had to get/go/arrive” is “get”: as a general rule, if there is an obligation/imperative “we had to…” use get. “She had to get ready by 5PM.” “I had to get there before 5PM.” “They had to get there at 6.”

Because our departure time ｗwas 10：0:00pm/10pm.

We enjoyed the Australian lifestyle.

We enjoyed + the (article) + noun. “We enjoyed the show.” “We enjoyed the series.” “We enjoyed the feast.”

I appreciated their hospitality.

Talking in the past tense as you’ve now left, and the actions of hospitality are in the past. Therefore you must use the past tense here.

I would love for theym (Mmy Australian friend and his wife) to come to Japan next time.

Grammar

When athe airplane took off, I could see a night view from aview of the city at night through the window, which was so beautiful.

“When the music stopped…” “When the bus left…” “When the plane took off…”