doing the maths...
Professor
Sorry, but i don't agree with your maths.
Assuming you got correct the length of the DHL A300 and the JAL 777 (54.1m and 73.9m), measuring the piccie gives about 7.1cm for the DHL and about
9.2cm for the JAL, so the respective scales are 1:762 and 1: 803 (approximately), a difference of about 94.7%. At 15000 feet this is a distance of about 800feet. Mind you, it's not easy to measure the JAL from the pic so there is an error introduced already...