Learn Hardcore Romanian: Aeroportul este deschis acum.

In Romanian the definite article is attached to the end of the noun. aeroport means “airport,” and adding -ul makes it definite: aeroportul = “the airport.” English uses a separate word (the), but Romanian uses these suffixes.

Why is the article a suffix rather than a separate word like in English?

Romanian grammar marks definiteness by suffixing the article onto the noun. For most masculine singular nouns it’s -ul (sometimes -le). It’s simply how the language has evolved—no separate word is needed.

Why does the sentence use este for “is”? Can I shorten it?

este is the full present-tense form of the verb a fi (“to be”). In informal speech or writing, you can contract it to e.
Example: Aeroportul e deschis acum. Both are correct, but este sounds more formal.

What part of speech is deschis, and why doesn’t it change form?

deschis is an adjective (the past participle of a deschide “to open,” used adjectivally). It agrees in gender and number with aeroportul, which is masculine singular. Hence deschis remains in the masculine singular form. A feminine noun would take deschisă.