31. The laws of physics apply just as much to a " stealth " aircraft as a non-stealth aircraft . 32. It can also engage and shoot down stealth aircraft , built to avoid normal radar detection, the report said. 33. Perry received his stealth aircraft technology. 34. The first combat use of purpose-designed stealth aircraft was in December 1989 during Operation Just Cause in Panama. 35. The Roman period, as well as parts of a F-117 stealth aircraft shot down by the Serbian army. 36. Over the years, DARPA has financed research that led to the creation of the Internet and stealth aircraft . 37. Early stealth aircraft were designed with a focus on minimal radar cross-section ( RCS ) rather than aerodynamic performance. 38. A : There are two types of stealth aircraft : the Lockheed F-117A fighter and the Northrop B-2 bomber. 39. The film follows three top fighter pilots as they join a project to develop an automated robotic stealth aircraft . 40. They also say that it is highly effective against stealth aircraft , stealth ships, etc . pending clutter can be reduced.