La tripulación dijo que una auxiliar de vuelo hablaría primero en español y luego en inglés.

Because tripulación is a collective noun in Spanish, just like crew in English. It refers to a group, but grammatically it is singular.

So:

• La tripulación dijo... = The crew said...

If you wanted to focus on the individual people, you could instead say:

• Los tripulantes dijeron... = The crew members said...

That is why the verb is dijo and not dijeron.

Dijo is the preterite of decir, and here it presents the statement as a completed event:

• La tripulación dijo... = The crew said...

Spanish often uses the preterite when reporting that someone made an announcement or said something at a specific moment.

By contrast, decía would usually suggest something more ongoing, repeated, backgrounded, or descriptive:

• La tripulación decía... = The crew was saying / used to say...

In this sentence, the idea is a single announcement, so dijo is the natural choice.

Que here means that and introduces a subordinate clause:

• La tripulación dijo que...
• The crew said that...

In English, that is often optional:

• The crew said that...
• The crew said...

In Spanish, que is normally required in this structure.

Yes. Auxiliar de vuelo is a common way to say flight attendant, and the article shows the gender:

• un auxiliar de vuelo = a male flight attendant
• una auxiliar de vuelo = a female flight attendant

The noun auxiliar itself does not change form here; the gender is shown by un/una.

In Spain, auxiliar de vuelo is a fairly neutral and standard expression. You may also hear azafata for a female flight attendant, but auxiliar de vuelo is less gender-marked and often feels more formal or neutral.

This is one of the most important grammar points in the sentence.

Hablaría is the conditional form, but here it is being used for the idea of future in the past.

The crew said something in the past:

• La tripulación dijo...

What they said would happen was still in the future from that past moment:

• ...que una auxiliar de vuelo hablaría primero...
• ...that a flight attendant would speak first...

So:

• dijo ... hablaría = said ... would speak

Compare:

• Dice que hablará = She says that she will speak
• Dijo que hablaría = She said that she would speak

This backshifting is very common in Spanish after a past reporting verb.

Yes, sometimes. You could say:

• La tripulación dijo que una auxiliar de vuelo iba a hablar primero...

This also means would speak / was going to speak.

The difference is subtle:

• hablaría sounds a bit more like standard reported speech
• iba a hablar can sound slightly more immediate or colloquial

In your sentence, hablaría is perfectly natural and very typical.

When Spanish names the language being used after en, it normally does not use the article:

• en español
• en inglés
• en francés

So:

• hablar en español = to speak in Spanish
• hablar en inglés = to speak in English

You would not normally say en el español or en el inglés in this context.

Here luego means then:

• primero en español y luego en inglés
• first in Spanish and then in English

It is very similar to después in this kind of sequence.

Compare:

• primero..., luego...
• primero..., después...

Both are possible. Luego is very common in Spain.

One small note: in some contexts luego can also mean later, so context matters. Here, because it follows primero, the meaning is clearly then / next.

This is a very natural Spanish word order.

The structure is:

• verb: hablaría
• adverb: primero
• language phrase: en español
• second sequence phrase: y luego en inglés

Spanish often places adverbs like primero after the verb:

• Hablaría primero...

You could move things around for emphasis, but the given order is the most straightforward and idiomatic.

Sometimes, depending on context, but crew is the best translation here.

On a plane:

• la tripulación = the crew
• la tripulación de cabina = the cabin crew

Staff is broader and can sound less specific. In this sentence, because it is about an announcement on a flight, crew is the natural choice.

Yes. Auxiliar de vuelo is a more neutral and professional term, similar to flight attendant in English.

• auxiliar de vuelo = more neutral/formal
• azafata = female flight attendant
• azafato = male flight attendant

Since modern usage often prefers less gender-specific job titles, auxiliar de vuelo is very common.

Because una auxiliar de vuelo is the subject of the verb hablaría, not a direct object.

The personal a is used before specific human direct objects:

• Veo a la auxiliar de vuelo = I see the flight attendant

But here:

• una auxiliar de vuelo hablaría...
• a flight attendant would speak...

That noun is doing the action, so no personal a is used.

If you turn it into direct speech, you would normally use the future instead of the conditional:

• La tripulación dijo: “Una auxiliar de vuelo hablará primero en español y luego en inglés.”

Direct statement:

• hablará = will speak

Reported statement:

• dijo que ... hablaría = said that ... would speak

So the conditional here is linked to reported speech from a past point of view.