I am not sure if you appreciate the limitations of manoeuvring a large aircraft quickly or sighting a small non moving object against a cluttered backdrop.
I do appreciate the limitations of seeing a small object. But this was not a factor as they did see it and reported this. I appreciate the ability of a large airplane maneuvering less so. Obviously it is less maneuverable than the sUAV, but they can turn fairly quickly when not limited to smooth turns for passenger comfort.