Duže kašnjenje leta je moguće.

Here duže is an adjective, not an adverb. It is the neuter singular comparative form of dug meaning long.

It agrees with kašnjenje, which is a neuter singular noun:

• dug let = a long flight
• duga stanka = a long break
• dugo kašnjenje = a long delay
• duže kašnjenje = a longer delay

So in this sentence, duže kašnjenje means a longer delay.

Kašnjenje is a neuter noun meaning delay or lateness. It comes from the verb kasniti meaning to be late.

Nouns ending in -nje are very often neuter in Croatian, so kašnjenje follows a very common pattern.

In this sentence, kašnjenje is the main noun of the subject phrase: duže kašnjenje leta = a longer delay of the flight / a longer flight delay.

Because after kašnjenje, Croatian normally uses the genitive to show what is delayed.

• let = nominative singular
• leta = genitive singular

So:

• kašnjenje leta = delay of the flight / flight delay

This is very natural in Croatian. English often uses a noun directly in front of another noun, as in flight delay, but Croatian usually shows that relationship with case, here the genitive.

Because it agrees with the subject duže kašnjenje leta, whose head noun is kašnjenje, and kašnjenje is neuter singular.

The adjective moguć means possible, and its forms include:

• moguć for masculine singular
• moguća for feminine singular
• moguće for neuter singular

So:

• Problem je moguć. = The problem is possible.
• Promjena je moguća. = The change is possible.
• Kašnjenje je moguće. = The delay is possible.

In this sentence, it is an adjective because it modifies the noun kašnjenje.

A good test is this:

• If it describes a noun, it is acting as an adjective.
• If it describes a verb, it is acting as an adverb.

Here:

• duže kašnjenje = a longer delay → adjective

Compare with:

• Let će kasniti duže. = The flight will be delayed longer / will be late longer. → here duže functions adverbially

So the same form can appear in different roles, but in your sentence it is modifying kašnjenje.

Yes, Croatian word order is much more flexible than English word order.

Your sentence is completely natural, but other versions are also possible, for example:

• Moguće je duže kašnjenje leta.
• Duže kašnjenje leta moguće je.

These versions all mean basically the same thing, but the emphasis shifts slightly.

Very roughly:

• Duže kašnjenje leta je moguće. focuses first on the longer delay
• Moguće je duže kašnjenje leta. starts with it is possible
• Duže kašnjenje leta moguće je. can sound a bit more formal or stylistically marked

Croatian often moves elements around for emphasis, rhythm, or style.

Because Croatian does not have articles like English a, an, and the.

So Duže kašnjenje leta je moguće can be understood in English as:

• A longer flight delay is possible
• The flight may be delayed longer
• A longer delay of the flight is possible

Which English version is best depends on context.

Croatian usually expresses definiteness from context rather than with articles.

This is a very useful distinction.

• dugo kašnjenje = a long delay
• duže kašnjenje = a longer delay

So:

• dugo is the basic positive form here: long
• duže is the comparative: longer

If you say dugo kašnjenje leta, you are simply saying the flight delay is long.

If you say duže kašnjenje leta, you are suggesting a greater degree of delay, often compared with what was expected, usual, or previously mentioned.

Yes, very much so. It sounds formal, neutral, and informational.

Croatian public notices often use this kind of concise style:

• Moguće su gužve. = Delays / congestion are possible.
• Moguće je kašnjenje. = Delay is possible.
• Duže kašnjenje leta je moguće. = A longer flight delay is possible.

In everyday casual speech, someone might also say something more direct, such as:

• Let bi mogao kasniti duže. = The flight might be delayed longer.
• Moguće je da će let više kasniti. = It is possible that the flight will be more delayed.

So your sentence is especially natural in formal or announcement-style language.

Yes, you could, and the meaning is very similar, but the structure is different.

• Duže kašnjenje leta je moguće.

  • noun-based, more formal
  • literally something like A longer delay of the flight is possible

• Moguće je da let kasni duže.

  • clause-based, more verbal
  • literally It is possible that the flight is delayed longer / will be late longer

The first sounds more like a notice or official statement.
The second sounds more like a full spoken sentence.

Both are correct; they just package the idea differently.