unkouzyouhou de unkousaikai wo kakuninsuru.

Here, で marks the means/source/place used to do something. A natural way to understand it is:

• 運航情報で = using the operation/service information
• or in the operation information

So the sentence means you confirm the service resumption by checking the operation information.

This is different from で meaning only a physical location like at. In this sentence, it is closer to by means of / through / in.

Because 運航再開 is the thing being checked, and 確認する normally takes a direct object marked by を.

So:

• 運航再開を確認する = confirm/check the resumption of service

A similar pattern would be:

• 時刻を確認する = check the time
• 予約を確認する = confirm the reservation
• 安全を確認する = check safety

It can be either, depending on context. In many practical Japanese sentences, 確認する often means:

• to check
• to make sure
• to confirm

In this sentence, check is often the most natural English wording, especially in instructions or announcements. But the nuance is not just casually looking; it suggests verifying something.

So 運航再開を確認する is more like:

• check whether service has resumed
• confirm the resumption of operations

Because it belongs to two different noun compounds:

• 運航情報 = operation/service information
• 運航再開 = resumption of operations/service

Japanese often builds meanings through compact noun combinations, and the same word can appear more than once if it is needed in both compounds. This sounds normal in Japanese, even if repetition feels a little heavy in English.

English would often avoid repeating it, but Japanese does not need to.

運航 is commonly used for the operation of things like:

• airplanes
• ships
• sometimes services involving navigation/transport operation

運行 is more often used for:

• trains
• buses
• general scheduled transport operations

In real usage, the choice depends on the type of transportation and industry wording. If this sentence is about air or marine service, 運航 is the natural word.

So a learner may notice that both can look like operation/service, but the preferred kanji often depends on what is being operated.

Yes. Japanese often omits the subject when it is obvious from context.

This sentence does not explicitly say:

• who checks
• what specific service is being resumed

Depending on context, the understood subject could be:

• you in an instruction
• we in a manual or notice
• an unspecified person in a neutral statement

So this sentence can sound like:

• Check the operation information to confirm that service has resumed.

The subject is left out because Japanese does that very naturally.

The dictionary form is commonly used in:

• headings
• instructions
• manuals
• notices
• list items
• neutral written statements

So 確認する here probably has an instructional or label-like feel, rather than sounding like a full conversational sentence.

For example, it may be functioning like:

• Confirm/check the resumption of service in the operation information.

If this were spoken politely, you might instead see:

• 運航情報で運航再開を確認してください。

It usually implies that operations had stopped, been delayed, or been unavailable, and then started again.

So 再開 means restart / resume. In context:

• 運航再開 = operations resume / service resumes

This is stronger than simply saying the service exists. It specifically suggests a return after an interruption.

Usually, で is the natural choice here because it shows the source/means used for checking.

• 運航情報で確認する = check/confirm using the operation information

If you used に, it would sound unnatural in this structure.

Japanese particles are very sensitive to the relationship between words. Here, the intended relationship is not destination or target of existence, but rather the resource used to verify something, so で fits best.

This is a very standard order:

• 運航情報で = using/in the operation information
• 運航再開を = the resumption of operations
• 確認する = confirm/check

Japanese typically puts the verb at the end, and the other elements come before it with particles showing their roles.

You could sometimes rearrange parts for emphasis, but this version is clear and natural. For a learner, it is best to treat this as a normal pattern:

• [source/means] で [object] を [verb]

Both views are useful.

Grammatically, it is a compound noun made from:

• 運航 = operation/service operation
• 情報 = information

Together, they function as one unit:

• 運航情報 = operation information / service status information

For learning, it is helpful to recognize both the parts and the full compound. Japanese uses many noun compounds like this, especially in signs, announcements, and formal writing.