Na aerodromu je uvek velika gužva pre svakog leta.

In Serbian, na aerodromu means at the airport.

A native English speaker often expects u because English uses in or at in different ways, but Serbian prepositions do not match English one-to-one. With some places, Serbian naturally uses na, and aerodrom is one of them.

So:

• na aerodromu = at the airport
• not usually u aerodromu in this meaning

Very roughly:

• u often means in / inside
• na often means on / at, but in many fixed location expressions it simply has to be learned

Here, na aerodromu is the normal idiomatic phrase.

Because after na when talking about a location, Serbian uses the locative case.

The noun aerodrom changes like this:

• nominative: aerodrom
• locative: aerodromu

So:

• na aerodromu = at the airport

This is a very common pattern:

• na fakultetu = at the faculty / at college
• na poslu = at work
• na moru = at the seaside

Je is the 3rd person singular present of biti = to be.

So the core structure is:

• gužva je velika = the crowd / congestion is big
• or, with the natural word order here: je velika gužva

In this sentence, je means is:

• Na aerodromu je uvek velika gužva...
• At the airport, there is always a big crowd...

Serbian often uses je in sentences where English would say there is.

Because velika gužva is the subject/predicate noun phrase, so it stays in the nominative case.

Breakdown:

• gužva = crowd, congestion, rush
• velika = big, large

Both are feminine singular nominative:

• velika gužva = a big crowd / heavy congestion

You would use veliku gužvu only in contexts where it is an object, for example:

• Vidim veliku gužvu. = I see a big crowd.

But here the sentence says that such a crowd exists/is present, so nominative is correct.

Gužva is a very common Serbian word. It can mean:

• crowd
• rush
• congestion
• busy crush of people
• sometimes even traffic jam / packed conditions, depending on context

In this sentence, velika gužva suggests:

• lots of people
• a crowded, hectic situation
• busy airport conditions before flights

So it is broader than just a crowd in the narrow sense. It often describes the whole feeling of bustle and overcrowding.

Yes, Serbian word order is fairly flexible, and uvek can often move.

The given sentence:

• Na aerodromu je uvek velika gužva pre svakog leta.

This is perfectly natural. But you may also hear:

• Na aerodromu uvek je velika gužva...
• Uvek je velika gužva na aerodromu...
• Velika gužva je uvek na aerodromu... — possible, though less neutral here

The most natural order usually depends on what the speaker wants to emphasize.

In your sentence, je uvek velika gužva sounds neutral and smooth.

Because the preposition pre means before, and it requires the genitive case.

So:

• pre
  • genitive

That is why both words change:

• svaki let = every flight
• pre svakog leta = before every flight

This is an important pattern to remember:

• pre puta = before the trip
• pre škole = before school
• pre sastanka = before the meeting

Because svakog is an adjective-like word meaning every, and it must agree with the noun it describes in:

• gender
• number
• case

Here, let is masculine singular, and after pre it must be in the genitive singular.

So:

• nominative: svaki let = every flight
• genitive: svakog leta = of every flight / before every flight

The adjective changes to match the noun:

• svaki → svakog
• let → leta

Here it means flight.

That is a great question because leto means summer, and its genitive singular is also leta. So leta can come from two different nouns:

• let = flight
• leto = summer

In this sentence, context makes it clear:

• pre svakog leta after talking about an airport obviously means before every flight

If it meant summer, the sentence would not make sense in this context.

Yes, you very often can, and it is good to know the difference.

Two common options are:

• pre svakog leta
• pred svaki let

Both can mean before every flight.

The difference is mainly grammatical:

• pre takes the genitive
• pred with movement toward a time/event idea often appears with the accusative

So:

• pre svakog leta = before every flight
• pred svaki let = before every flight

In many everyday contexts, both are natural. Pre is very common and straightforward, so it is an excellent form to learn first.

Because Serbian, like English, often uses the singular after every.

Compare:

• English: before every flight
• Serbian: pre svakog leta

So Serbian is behaving very similarly here. The idea is not before all flights collectively, but before each individual flight.

If you wanted a plural idea such as before all the flights, you would express it differently.

Velika gužva is very natural and idiomatic.

Other possible expressions exist, for example:

• puno ljudi = a lot of people
• gužva je velika = the crowding is big
• uvek je gužva = it is always crowded / there is always a crowd

But velika gužva is especially common in everyday Serbian for busy, crowded conditions.

So your sentence sounds very natural:

• Na aerodromu je uvek velika gužva pre svakog leta.

Word-for-word, you might be tempted to do that, but it is not good English.

A more natural English translation is:

• There is always a big crowd at the airport before every flight.
• or The airport is always very crowded before every flight.

This is a useful reminder that Serbian and English organize sentences differently:

• Serbian: Na aerodromu je...
• natural English: At the airport, there is... or The airport is...

So when learning Serbian, it helps to understand the grammar literally, but translate naturally.