Why is it not standard, that in the section http://forum.skyscraperpage.com/forumdisplay.php?f=29
oldest requests are first worked off?
In my opinion this is the best way, as links valid when made the request, may not be valid any more after some time. Newer requests should only have priority, if one of the source links may expire soon, which is e.g. true, when Swisstopo ( https://map.geo.admin.ch/?topic=avia...2820.00&zoom=5
) is used as source.