I photographed these 1941-vintage Waco UPF-7 biplanes during various air shows at Paine Field and at the Pima Air Museum in Tucson.

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Waco UPF-7 #5532

Pima Air Museum 2017

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Waco UPF-7

Paine Field 2016

HFF, Paine Field 2019

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1942 Waco UPF-7 #5871

Paine Field 2012

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1941 Waco UPF-7 #5540

Museum of Flight 2008

Paine Field 2012

Paine Field 2013

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1941 Waco UPF-7 #5712

WAAAM, Hood River 2021

WAAAM, Hood River 2023