Assuming the underlined phrase is during the flight, it would be a misplaced phrase.
Appositive and adjective phrases both act as adjectives in that they modify a noun or a group of nouns, describing them in more detail. This phrase, during the flight, describes the action - watching a documentary, and thus would be more of an adverb phrase rather than any of those two. Since adverb phrase/participial phrase is not an option, misplaced phrase should be correct. It means that the phrase is located in the wrong place in the sentence - the way this sentence is written, it would seem that the penguin migration is taking place during the flight. The correct sentence would be: During the flight, Michael watched a documentary about penguin migration.