El agente de asistencia en tierra preguntó por el paradero.

Because preguntar por is a very common Spanish pattern meaning to ask about someone or something.

So:

• preguntar = to ask
• preguntar por alguien/algo = to ask about someone/something

In this sentence, preguntó por el paradero means he/she asked about the whereabouts.

If you used only preguntó, the sentence would usually need a direct question or clause after it, such as:

• Preguntó dónde estaba. = He/She asked where he/she was.

So por is not random here; it is part of the normal structure.

Here, el paradero means the whereabouts or the location of someone whose location is unknown.

It is a fairly formal or neutral word. You often see it in contexts like:

• Se desconoce su paradero. = His/Her whereabouts are unknown.
• Preguntaron por el paradero del pasajero. = They asked about the passenger’s whereabouts.

A learner should know that paradero does not usually mean just any ordinary location. It often suggests that someone is missing, not present, or cannot be found.

Spanish often uses the definite article where English may not.

So Spanish says:

• preguntó por el paradero

where English might simply say:

• asked about the whereabouts

This is normal. Spanish nouns frequently appear with articles even when English uses none. The article helps present paradero as a concrete concept: the whereabouts / the location in question.

The accent mark shows both pronunciation and verb form.

preguntó is:

• pretérito indefinido in Spain terminology
• third person singular
• from preguntar
• meaning he/she asked

Compare:

• pregunto = I ask / I am asking
• preguntó = he/she asked

The written accent is important because without it, the word would be read differently and would mean something else.

The preterite is used because the sentence describes a completed action in the past:

• El agente ... preguntó ... = The agent asked ...

It sounds like one finished event: the ground assistance agent asked about the whereabouts.

If you used the imperfect, preguntaba, it would suggest something more ongoing, habitual, or backgrounded, such as:

• El agente preguntaba por el paradero mientras revisaban la lista.
  = The agent was asking about the whereabouts while they checked the list.

So preguntó is the natural choice for a single completed action.

It means something like the ground assistance agent or the ground handling agent.

The phrase breaks down like this:

• el agente = the agent
• de asistencia = of assistance / assistance-related
• en tierra = on the ground / ground-based

In airport language, asistencia en tierra refers to services provided on the ground rather than in the air. So this is someone working in airport ground support or passenger assistance.

A very literal translation may sound clunky in English, but the Spanish structure is natural.

Because Spanish usually places descriptive information after the noun much more often than English does.

English often stacks nouns and modifiers before the main noun:

• ground assistance agent

Spanish normally prefers a structure like:

• agente de asistencia en tierra

This is one of the most common differences between English and Spanish word order. Spanish often uses:

• noun + de + noun
• noun + adjective
• other post-noun phrases

So the Spanish sentence is following a very normal pattern.

Literally, yes, en tierra means on the ground or on land, but in this airport context it means ground-side or ground-based.

So here it refers to airport operations that happen on the ground, not in flight. That is why a more natural English rendering would be:

• ground assistance
• ground handling
• ground support

rather than the more literal assistance on land.

It is common enough to recognize, but it sounds a bit more formal or official than simply asking where someone is.

For example:

• ¿Dónde está? = Where is he/she?
• No sabemos su paradero. = We do not know his/her whereabouts.

So paradero is very common in news reports, official statements, customer service, transport, and situations where someone’s location is being checked or tracked. In casual conversation, people often prefer simpler wording.

Yes, that is possible, but it changes the structure and slightly changes the feel.

• preguntó por el paradero = asked about the whereabouts
• preguntó dónde estaba = asked where he/she was

The first is more nominal and a bit more formal. The second is more direct and clause-based.

Spanish often allows both styles:

• Preguntó por el pasajero. = He/She asked about the passenger.
• Preguntó dónde estaba el pasajero. = He/She asked where the passenger was.

So the original sentence is not the only option, but it has a specific formal tone.

The sentence does not explicitly say. El paradero usually implies someone’s whereabouts, but the person or thing is understood from the wider context.

For example, in a longer text, the previous sentence might mention:

• a passenger
• a suitcase
• a colleague
• a vehicle

Then preguntó por el paradero means the agent asked where that person or thing was.

So grammatically, the sentence is complete, but semantically it depends on context.

Yes, it works perfectly well in Spain, and nothing in it sounds un-Spanish for Spain.

A few notes:

• pretérito indefinido like preguntó is completely standard in Spain.
• asistencia en tierra is normal in transport or airport contexts.
• paradero is also standard.

The sentence is not strongly regional; it would be understood in many Spanish-speaking places. But it fits Spain Spanish just fine.