Draw the great-circle track between takeoff point and coast crossing. Test the speed against that track, making some allowances especially at the beginning. If it passes sanity check, back off from the coast (the nearest fixed point) the measured time.

Determine which side of the aircraft the seat is on. Guestimate the camera down-angle; figure where the center of the frame would be based on this and the track. (This may be a waste of time, as the accuracy of the track may be low enough that this correction is irrelevant.)

Calculate the size of the feature from the distance and focal length and sensor size.

Select topographic mode in Google maps. Zoom to a scale where the feature size will be about the same as in the photo.

Orient the photo to match the map orientation.

Look around the area for matches.

Eventually, give up in frustration.

(Sorry, I've got time to speculate briefly, but not time to actually see how it works; work, and Minicon this weekend, are killing my time.)