Answer:
"Flags Flying In The Sniff Wind" is a NOUN PHRASE.
It is not appositive phrase.
Explanation:
Group of words which function as a noun are known as Noun Phrases.
It is not appositive because appositive phrases rename the noun next to it.
For example: "Ben is teaching in school" is a noun phrase but it becomes appositive if it is this way: "Ben, an English lecturer is teaching in school".
Therefore, "Flags Flying In The Sniff Wind" is a NOUN phrase and NOT APPOSITIVE.