Channel A ended on 2009-09-24.
I may be missing something here, along the lines of a definition, but isn't the 'forward' channel at one end of the link the 'reverse' channel at the other end, and isn't the 'reverse' channel at the first end the 'forward' channel at the opposite end ?
The Preview Channel ended in 1998.
Unexplained Channel ended in 2010.
Channel Airways ended in 1972.
Audi Channel ended in 2009.
The Baby Channel ended in 2008.
The Life Channel ended in 1986.
Channel Express ended in 2002.
The Jewelry Channel ended in 2008.
Channel M ended in 2012.
C Channel ended in 1983.
Z Channel ended in 1989.