In this decade, development of advanced stealth aircraft continued at a low but steady pace.  Unlike the 1950s, during which America had an "anything goes" attitude toward experimental aircraft development, the 1990s were a time of deliberate and focused goal-specific technology research. 

Like in the 1990s, models of contemporary X-planes were few and far between, but those that did make it to market boasted designs that were as sleek and sinister as anything out of an old science-fiction fantasy.

YF-23 BLACK WIDOW (1990)

GENERAL DYNAMICS A-12   AVENGER ii (1991)

BELL "EAGLE EYE" UAV (1992)

RQ-1A PREDATOR (1995)

BOEING BIRD OF PREY (1996)

X-Planes & Prototypes

1900-1930

1940s

1950s

1960s

1970s

1980s

1990s

2000 and Beyond