Số hiệu chuyến bay ở trên thẻ hành lý.

Vietnamese often does not use a copula like is/are when talking about location.

So:

• Số hiệu chuyến bay ở trên thẻ hành lý
• literally: Flight number located on baggage tag

Here, ở expresses location, so a separate word for is is unnecessary.

Compare:

• Cuốn sách ở trên bàn. = The book is on the table.
• Nhà vệ sinh ở đâu? = Where is the bathroom?

But Vietnamese does use là in other situations, especially for identification/equations:

• Đây là thẻ hành lý. = This is a baggage tag.

So in this sentence, no là is needed because it is a location sentence.

Số hiệu means something like number/identification number/code.

In this sentence:

• số hiệu chuyến bay = flight number

Why not just số?

• số = number in a general sense
• số hiệu = an identifying number, label, or code

Examples:

• số điện thoại = phone number
• biển số xe = license plate number
• số hiệu chuyến bay = flight number / flight code

So số hiệu sounds more like an official identifying number, which fits airline usage well.

Chuyến bay means flight in the sense of an airline journey.

Breakdown:

• chuyến = trip/journey/run (often used for transport or trips)
• bay = fly

Together:

• chuyến bay = flight

Examples:

• chuyến bay quốc tế = international flight
• chuyến bay nội địa = domestic flight
• số hiệu chuyến bay = flight number

So the phrase is built naturally as:

• số hiệu
  • chuyến bay
• the identifying number of the flight

Vietnamese noun phrases usually go from the main noun to the thing that specifies it.

Here:

• số hiệu = the main noun (number/code)
• chuyến bay = specifies what kind of number

So:

• số hiệu chuyến bay = the flight’s number / flight number

This is very common in Vietnamese:

• màu áo = color of the shirt
• tên trường = name of the school
• giá vé = price of the ticket

English often prefers modifier + noun (flight number), but Vietnamese often uses a structure closer to noun + of + noun.

Ở trên means on / on top of / located on.

In location sentences, Vietnamese often uses:

• ở = at/in/on (general location marker)
• plus a position word like trên (on/above), dưới (under), trong (in), ngoài (outside)

So:

• ở trên thẻ hành lý = on the baggage tag

You may also hear:

• trên thẻ hành lý

without ở, especially in shorter or more compact styles. Both are understandable, but ở trên makes the locational meaning especially clear.

Compare:

• Sách ở trên bàn. = The book is on the table.
• Sách trên bàn. = The book on the table / The book is on the table, depending on context.

So ở trên is a very natural full location expression.

In many everyday contexts, ở trên simply means on.

For a flat object like a tag, card, sign, or paper, Vietnamese often uses trên where English uses on:

• trên vé = on the ticket
• trên hộ chiếu = on the passport
• trên màn hình = on the screen
• trên thẻ hành lý = on the baggage tag

So here you should understand it as normal on, not necessarily emphasizing physical height or “top side.”

Thẻ hành lý means baggage tag or luggage tag.

Breakdown:

• thẻ = card, tag, badge
• hành lý = luggage, baggage

So:

• thẻ hành lý = baggage tag

This is the tag attached to checked luggage, or sometimes the baggage claim tag depending on context. In an airport context, that is the natural meaning.

Vietnamese does not have articles like a/an/the.

So nouns are often left without any article word, and the meaning is understood from context.

• Số hiệu chuyến bay ở trên thẻ hành lý.
• can naturally mean The flight number is on the baggage tag.

If the context already makes it clear which flight number and which tag are meant, nothing extra is needed.

Vietnamese relies much more on context than English does for definiteness.

It can function as a complete sentence.

Structure:

• Số hiệu chuyến bay = subject/topic
• ở trên thẻ hành lý = location/predicate

So it means:

• The flight number is on the baggage tag.

Vietnamese often allows very compact complete sentences, especially in practical instructions, signs, or explanations.

It could also appear in a context where the style is intentionally brief, such as airport instructions or customer-service language.

Yes, you could, and it would still be correct.

• Số hiệu chuyến bay = more compact, very natural
• Số hiệu của chuyến bay = more explicit, a bit heavier

The word của often marks possession or “of” relationships:

• tên của tôi = my name
• màu của áo = the color of the shirt

But in Vietnamese, của is often omitted when the relationship is already clear, especially in fixed noun phrases.

So số hiệu chuyến bay is the more natural choice here.

Yes. Mã chuyến bay is also very common and often sounds very natural in modern usage.

Compare:

• số hiệu chuyến bay = flight number / flight code
• mã chuyến bay = flight code / flight number

In many real airport or booking contexts, people may use either one. The difference is small:

• số hiệu emphasizes the identifying number/designation
• mã emphasizes a code

For example, VN123 can be thought of as both a số hiệu and a mã.

The original sentence is already correct, but in everyday speech people might also say:

• Số hiệu chuyến bay nằm trên thẻ hành lý.
• Số hiệu chuyến bay có trên thẻ hành lý.
• Trên thẻ hành lý có số hiệu chuyến bay.

These are slightly different in emphasis:

• ở trên = is located on
• nằm trên = lies/is found on
• có = there is / has
• Trên thẻ hành lý có... = On the baggage tag, there is...

All are natural depending on context.

A good way is to break it into chunks:

• số hiệu
• chuyến bay
• ở trên
• thẻ hành lý

So rhythmically:

• số hiệu / chuyến bay / ở trên / thẻ hành lý

This helps because each chunk is a meaningful unit:

• số hiệu = number/code
• chuyến bay = flight
• ở trên = on
• thẻ hành lý = baggage tag

If you try to say it all at once, it can feel long, but as four chunks it becomes much easier.