Real(Mislabeled) - Captioned as: "B-52 Breaking the Sound Barrier" - This is a B-52 Bomber flying thru a moisture/condensation barrier at subsonic speed.... another link: http://www.spacewar.com/reports/Boeing_B52_With_CONECT_Upgrade_Accomplishes_First_Test_Flight_999.html and discussion in comments: https://reposti.com/p/V7 (644 mph top speed for B-52(I don't know about secret versions.) vs 768 mph speed of sound.)
RAF Tornado GR4. These things were most feared by the Taliban in Afghanistan. They would come in under 200 feet and unleash hell.