The error is a misuse of verb tense, specifically an incorrect form of the past participle in the present perfect tense.
People often make this error due to confusion between simple past and past participle forms. For irregular verbs, the past and past participle forms can differ, as in the case of "fly", which can lead to mistakes.
The correct form is "has flown" because "flown" is the past participle of "fly", which is required for the present perfect tense.
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