Their use of regional airports, but describing them as primary airports. Sorry, but there is nop way in hell that Prestwick should be described as a Glasgow airport. Similarly, Torp is in no way an Oslo airport
I think one of the best examples of this is frankfurt-hahn, which is 120km outside of frankfurt am main. I know we have london-stanstead and london-luton but a comparison would be to rename birmingham international - London-Birmingham. 90 minutes is the time on the road to get to frankfurt am-main from hahn, longer than it takes to fly from any london airport to frankfurt am main.