From a link seen elsewhere:-
The Wall Street Journal has made a 19-minute documentary about the United States’ U-2 spy planes who continue to use film photography in its operations. Photographs are shot with wet-plate cameras before being shipped to their base in California for developing and analysis. The documentary explores this process and why the US military continues to use wet-plate photography.
The video is a closer look in general at the U2 rather than just about how it records images, plus the journalist enjoys the (rare?) privilege of a flight. All quite interestingWatch the documentary
here.