boomless cruise

== English == === Alternative forms === boom-less cruise === Etymology === boom +‎ -less +‎ cruise. From eliminating the apparent sonic boom during the supersonic cruise portion of a flight. === Noun === boomless cruise (countable and uncountable, plural boomless cruises) (aviation) A technique for supersonic flight where the sonic boom does not reach the Earth's surface, by taking advantage of atmospheric conditions to refract the shockwave upwards, away from the ground.