Flight 521 may refer to:
- United Airlines Flight 521, air accident on May 29, 1947
- Aeroflot Flight 521, air accident on September 21, 2001
- Emirates Flight 521, air accident on August 3, 2016
This disambiguation page lists articles associated with the title Flight 521.
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If an internal link led you here, you may wish to change the link to point directly to the intended article.