Above: a Swiss Avro RJ-100 just before landing at Brussels airport (BRU) in 2009.

The BAE 146 family
They started with 3 sizes, and later updated them. In total the family sold around 390 airliners, which makes it a succesfull airliner for the British aviation industry.
Besides the succes of the Avro RJ-100 also the Avro RJ-85 has sold well.

End of 22 years of production
November 27th 2001 British Aerospace (BAE Systems) cancelled to entire program to renew the Avro RJ-85 and RJ-100. November 26th 2003 the last Avro Regional Jet was delivered to Blue 1 and production ceased after 22 years. First delivery of an BAE 146 was in 1983.

100-seater airliners
After 2003 the market for 100-seaters seems to be divided between Bombardier and Embraer. From 2003 Canadair started to deliver the CRJ-900 (which is a 100-seater) and from 2005 Embraer started to deliver the E-190.
At the time of production of the Avro RJ-100, the Canadair CRJ-200 and Embraer RJ-145 were much smaller as being only 50-seaters. The Fokker F-100 and Fokker F-70 were the size of the Avro Regional Jets.