The BAE Systems Hawk single-engine, jet-powered advanced trainer aircraft.

Its a fast, loud, great looking plane that is used around the world a as a jet fighter trainer.

Add to this, that its and a real crowd pleaser at air shows, therefore you see it in many painted configurations.

Here it is in the colours of the South African flag taken by me.

Here is one from Wikipedia in regular gray.

Royal Air Force colours.

Source

Royal Air Force Red Arrows colours.

By Myself (Adrian Pingstone). - My own photograph, taken with a Nikon D50 DSLR and an 18-200mm Nikon lens., Public Domain, Link

Indian Navy colours.

By Indian Navy, CC BY 2.5 in, Link

Indonesian Air Force cammo colours.

By Photo By Indonesian Air Force - Instagram.com/@tniudara, Public Domain, Link

Then, my favorite.

By Photo: Cpl Paul Oldfield/MOD, OGL, Link