FILE- In this Monday, Jan. 26, 2015, file photo, with the grass field tray outside, a U.S. Customs and Border Protection Black Hawk helicopter circles above University of Phoenix Stadium, site of the NFL Super Bowl XLIX football game, during a security demonstration for the media in Glendale, Ariz.  With a retractable roof and field that can been wheeled out into the sunlight, the stadium is unlike any other stadium in the world. (AP Photo/Ross D. Franklin, File)

GLENDALE, Ariz. (AP) — With its retractable roof and moveable field, University of Phoenix Stadium is unlike any stadium anywhere.

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