Looping the Hawker Hunter
Attached are links to videos showing 22 RAF Hawker Hunter aircraft looping in close formation at world famous airshows.
So why in 2015 is a single Hunter unable to loop successfully and safely at an airshow?
https://en.wikipedia.org/wiki/World_record_loop
Black Arrows - CXI (F) Squadron
https://www.youtube.com/watch?v=Uwn9DSG6Hvo