Unknown fast object appears in down-loaded photo

On April 16th 2021 at 11:32am I took a photo of a cloud that had caught my attention due to the bright very light yellow glow of the cloud. I was facing southeast (approx. 100 deg. magnetic); this glow was like a sundog. Approximate elevation of the cloud was 45 degrees. The sun was high in the south-southeast. The cloud was also the only “formed” cloud in the area of my vision. I was using a Canon Power-Shot SX620-HS; I was zoomed at 25.65mm,f5.6 aperture at 1/500 of a second. After that shot, I zoomed out to 9.61mm and took a second photo from the same stance at f4.5 aperture at the same, photo data recorded 11:32AM and at a faster speed: 1/640 of a sec.
I personally did not see the object when I took the photo! When I downloaded the camera there was the object. Then I looked at the second photo and there is no object. The area I was facing is toward the Davis-Monthan AF base (?)That object crossed my camera frame in less than a second.
 I am a former Navy asst. navigator and currently a retired professor.