B-2 Spirit stealth bomber of the USAF. Stealth aircraft are designed to avoid detection using a variety of advanced technologies that reduce reflection/emission of radar, infrared, visible light, radio-frequency (RF) spectrum, and audio, collectively known as stealth technology. Development of stealth technology likely began in Germany during World War II. Well-known modern examples of stealth aircraft include the F-117 Nighthawk, the B-2 Spirit, the F-22 Raptor,and the F-35 Lightning II.
A-10 Warthog...love, love, love this little tank killer! It's amazing how quiet they can be. Was at Langley waiting for hubby by the flightline when a couple popped over the hangar behind me and "practice" strafed the jets parked on the apron. I don't know who they had cleared it with, but it was definitely a surprise to the flightline personnel :).