Stage or Chapter III Noise Regulations within the EC came into force on March 31st 2002. The effective cull this created of aircraft types which were allowed to be operated into or within the EU was enormous.
In the 1990s
SSTO not only stood for
Single Stage To Orbit rockets but also
Supersonic Transport Operations. For these disaster struck on July 28th 2000 when the Air France Concorde F-BTSC operating Charter Flight AF4590 fell onto a hotel in Gonesse near Paris. Concorde having been a sensation for many was torn from the skies overnight but re-entered service on a limited basis during 2003. But on October 28th 2003 the final Concordes were pulled from revenue-earning service.
In the 1990s
FLA or Future Large Aircraft was a concept: The stretched Boeing 747 and Airbus A3XX became reality during the following decade - Boeing 747-8 and Airbus A380-800 respectively.
McDonnell Douglas was subsumed by Boeing on
November 11th 1996 having been a major manufacturer of the 1990s.
Finally a couple of miscellaneous statistics:
Flying over the Atlantic Ocean has become a bumpier experience on the whole since the 90s. Also with regard to
Air Rage 1999 was the worst year on record for Disruptive Passenger incidents followed by 2001. Both have since been surpassed by 2015 and this year is not looking too clever either.
Best of luck with your project